Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4fcc6d1f7de333…

MALICIOUS

PDF

92.0 KB Created: 2021-06-06 00:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5f58b20c1d536cf25d2855b3f2d29eca SHA-1: d9adf5bf961723d00ce07f0fb77e564550a55052 SHA-256: aa4fcc6d1f7de333e010cecbf48c883ebb504fd181b79ec0f5381ff4d22d769d
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pelibifir.ru/123?utm_term=olum+njanum+aarum+kaanathe+video+song PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452376/normal_5ff8c5e27ae6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405651/normal_605c01b7ebb1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378845/normal_6005a10a1252a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409244/normal_5ffe1973e6a2e.pdfIn PDF document text
    • https://jepiweluzobadur.weebly.com/uploads/1/3/5/3/135300479/tejabekolopumile.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489052/normal_6039754aa54ec.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4412413/normal_60b6f8167d327.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403407/normal_6058b05d93784.pdfIn PDF document text
    • https://vebiponexuxewi.weebly.com/uploads/1/3/4/7/134758887/6582579.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466666/normal_602381df495de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412996/normal_6013a2914108d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503050/normal_5fd1002162d2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459321/normal_60168a666b397.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375705/normal_600208b59511f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411273/normal_602789a498335.pdfIn PDF document text
    • https://fofezuse.weebly.com/uploads/1/3/0/7/130739341/8bf272175a1e87c.pdfIn 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
    • http://www.opentle.orgIn PDF document text
    • http://fodorafirig.pbworks.com/f/23940350012.pdfIn PDF document text
    • http://guleribiko.pbworks.com/f/how_much_should_a_babys_head_circumference_grow.pdfIn PDF document text
    • http://jesababa.pbworks.com/f/81403235696.pdfIn PDF document text
    • http://dajodovilav.pbworks.com/f/fozaviposikawoxepofekazar.pdfIn PDF document text
    • http://mapaduzipi.pbworks.com/f/how_do_i_transfer_whatsapp_from_android_to_iphone_using_google_drive.pdfIn PDF document text
    • http://xesimisejek.pbworks.com/w/file/fetch/144506778/multiplying_fraction_word_problems_7th_grade.pdfIn PDF document text
    • http://najajadux.pbworks.com/w/file/fetch/144585858/21691379129.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
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73C 3928 bytes
SHA-256: b1d7c9f12f0a1a773734f3145fe059b4a6ef6c2dff7cf0e178176ca131681750
font_01_sfnt_off0000e395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE395 5464 bytes
SHA-256: 48182806f82e659ca8bfb7b44b5c78a463fcbc6e1f30745900eb76273401bf16
font_02_sfnt_off0000f5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FE 6404 bytes
SHA-256: 384e7d8e6191d6c777445d7780a90de6dfa73abc1e4e18f88549a8b8096ca981
font_03_sfnt_off00010cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFA 6148 bytes
SHA-256: 488ffee5e9c33bcc1f3f00aec749f35977d0cdd209ffadaee35194d66ecc177d
font_04_sfnt_off00011cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDA 10284 bytes
SHA-256: af14329058a8594e1d7349b91201186ed9bf299010d5d243b5865d8a02996c82
font_05_sfnt_off0001402e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1402E 19128 bytes
SHA-256: fa3faa47206c9d2fab02440316774ddc735e31c88c481aca45e2890b48c9ccef

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