Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd176c103a0eb643…

MALICIOUS

PDF

125.0 KB Created: 2021-03-20 08:00:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: aea68c31300f53826cc1260900619ffc SHA-1: 2a1df7ab6c6456f0515a44c6fea2b4380976eef7 SHA-256: cd176c103a0eb643d1b8d90e50f33f52d10687ce4edac7c04380b74251cf86e6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded URI pointing to 'zajinet.ru', which is flagged as suspicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host multiple links on disposable domains, suggesting a phishing or spamming operation. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://zajinet.ru/wix?keyword=ramanichandran+novels+app PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383923/normal_6024bc0701a91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454668/normal_5fd62f6355eb5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485927/normal_5ff53b4f1c0c7.pdfIn PDF document text
    • http://nawitovafoxuw.22web.org/railway_psychological_aptitude_test.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412606/normal_5fd6eb8c6cebf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417321/normal_6009464271b02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374708/normal_5fd23886dc471.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495400/normal_5fcaf2014e8bd.pdfIn PDF document text
    • http://xoluzezo.22web.org/caffitaly_s24_instruction_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413008/normal_5fd898a7498e7.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_c425871d3ebf450885eb8cb54200e94f.pdf?index=trueIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_850c290aab01472fafc59ec5a55a7f38.pdf?index=trueIn PDF document text
    • http://pafapijeneradab.rf.gd/ppt_dengan_animasi_keren.pdfIn PDF document text
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_71141acdca0f47bdafaf9255a273e22f.pdf?index=trueIn PDF document text
    • https://804b95bc-9ca4-448d-a094-5a8e1ff69a26.filesusr.com/ugd/99d1da_ebc6e578216e43129ff8f2a0699eace0.pdf?index=trueIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_49a061762d7f479eba0c95b215dcd74c.pdf?index=trueIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_dba7926376e24c98986ae5ac72d14373.pdf?index=trueIn PDF document text
    • http://babefuv.epizy.com/pp_corrugated_sheet_singapore.pdfIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_6b59e86047834669a3c6105a31c869ca.pdf?index=trueIn PDF document text
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_842a1d741fdb49479b7e8515bb1cd0ca.pdf?index=trueIn PDF document text
    • http://wijogural.epizy.com/yaari_avneet_kaur_song_djjohal.pdfIn PDF document text
    • http://zevofelajasuz.epizy.com/kevagu.pdfIn PDF document text
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_d72f5f35b0c34494a99e5525a3776057.pdf?index=trueIn PDF document text
    • http://kodiluzamod.rf.gd/flashback_2_x4_looper.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00014c1d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14C1D 22324 bytes
SHA-256: 5a66ea15106e72d91a51566a8c0cd8c9dd4b70d8d4d6eccfb7a3a9d9ea0013ea
font_00_sfnt_off000139f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F4 5380 bytes
SHA-256: 200d928b3307005637f47e7e0bf59a134c68aaac03f46fbfe98f9efb0ba41d23
font_02_sfnt_off00017aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AA8 14588 bytes
SHA-256: b15478137d64d97876b45765b084cd27fbf516f1ad506cbacd1f3696b99d1779
font_03_sfnt_off0001a600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A600 3028 bytes
SHA-256: 0b52f8a6a329a47af3130a47932c1c5a20bc0d70b17585f6794bc1e699128191
font_04_sfnt_off0001b17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B17C 2564 bytes
SHA-256: 1f6aeda88a5e3c63a011975f66859ff0972a3c273954e83c67576d05c7e34753
font_05_sfnt_off0001bc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC95 11340 bytes
SHA-256: 83fbdc9e3a2a3ab7a3cc69403836cfba6eae0126dc1bbdba4c6ad800a217544f

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