Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a962997b8b9ff9…

MALICIOUS

PDF

80.0 KB Created: 2021-03-10 11:57:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a99ceb08dec15d7ab01e429c08f24639 SHA-1: b4c78a20c1c3ffdee35c7de58eba84988433e79a SHA-256: c8a962997b8b9ff928740508767926b07d07d4dad278b966c33c8f7a3cacbe01
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable hosting and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/123?utm_term=dj+remix+punjabi+bhangra+song PDF link annotation
    • http://juilopkiretlo.ru/99345448312sufaz.pdfIn PDF document text
    • http://save50.pro/the_graveyard_book_reading_guidex1up6.pdfIn PDF document text
    • http://bigwin-1xbet.fun/reduzorizokamrj29o.pdfIn PDF document text
    • http://fikunigogijori.22web.org/26754950503.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383160/normal_6017884cf0b15.pdfIn PDF document text
    • http://rimaloxal.22web.org/teroxa.pdfIn PDF document text
    • http://tryraisins.pro/how_to_do_iyengar_yoga09788.pdfIn PDF document text
    • http://ek-arenda.ru/busepakeginy1yk6.pdfIn PDF document text
    • http://favodokoleti.mypressonline.com/how_long_for_capped_brood_to_hatch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421787/normal_60206ffe0c67f.pdfIn PDF document text
    • http://nout-sale.site/69370162476edvpp.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/koposimifu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://verepipu.epizy.com/5111754982.pdfIn PDF document text
    • http://kasabapagikaki.rf.gd/41613338832.pdfIn PDF document text
    • http://kofepiropi.onlinewebshop.net/acog_practice_bulletin_no._76_postpartum_hemorrhage.pdfIn PDF document text
    • https://0ea1ff7f-05b3-43a2-9744-178351a05ed1.filesusr.com/ugd/01f9b9_961bd224ad7e4f7daf52c8fd2e0a3daf.pdf?index=trueIn PDF document text
    • https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_247e51ccee554e30b3b38d13da5263a5.pdf?index=trueIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_e679ce30de054d449b44e3c6eda9d487.pdf?index=trueIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD598 5484 bytes
SHA-256: a68efe91e539aa255aa0f4dd7d1ccc342fe3ea7074461f0e61c187edfad75a12
font_01_sfnt_off0000e81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81F 2936 bytes
SHA-256: ffc2ecfc22d8858b05522a807e03c332d294600ddd7a8acba7f25832f40bd719
font_02_sfnt_off0000f47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47E 11180 bytes
SHA-256: 97c3b6ae62ad12769ed3da12eb5cf2f67051060e2ef92796a6363b9123955b82
font_03_sfnt_off0001199c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199C 16572 bytes
SHA-256: 28da33ee266232bee255880df1e6df4ebadfd84973d0e1ebdedc76e4e75a96c4

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