Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9049d6e74b9e19…

MALICIOUS

PDF

98.8 KB Created: 2021-03-13 13:05:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: cffc8f8414395f03361d1fb6b98fac2f SHA-1: 9cd97392705cdbbf718f89dffda473b1e98c286d SHA-256: 3c9049d6e74b9e19d3df1909329145f9a0352b5e4bb93443a13cbf830035b00d
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links to other documents hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/aws?utm_term=what+is+the+structure+of+a+formal+report PDF link annotation
    • https://cdn.sqhk.co/nedupugifuka/kij89hj/instrumental_beats_2019_download.pdfIn PDF document text
    • https://cdn.sqhk.co/relulapezele/gghb0ww/38104471863.pdfIn PDF document text
    • http://vsspb.ru/friends_tv_show_wallpaper_mobile9muh8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451766/normal_5ff55b24eb65f.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/LghjiZn/game_of_thrones_cast_season_5_episode_4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495059/normal_5fd93c73ba68a.pdfIn PDF document text
    • https://cdn.sqhk.co/lunexubafexo/jxgficL/lowosekovagotulus.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/he0Bvji/scary_clown_pennywise_fake_chat_and_video_calls.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447434/normal_60163a164c114.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369794/normal_5fdbea5d90219.pdfIn PDF document text
    • http://busibear.com/794322187661x2mx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_6def4ccc750e4fceaac1b79f8065d4a5.pdf?index=trueIn PDF document text
    • https://04a9e765-cf69-4035-9b9a-998d8fb4e692.filesusr.com/ugd/8c5016_a1897564031d46aab01795b8308a070c.pdf?index=trueIn PDF document text
    • https://6323cc82-cf72-43ae-bc7a-f8d691a1d37e.filesusr.com/ugd/4f3578_7916f41b0e9a4b90892fcbcb24e01420.pdf?index=trueIn PDF document text
    • https://e29a9437-b0a5-48a6-9afa-908397ce514a.filesusr.com/ugd/16a9c1_5e4ba127160a48a4b365707fac7d822f.pdf?index=trueIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_0b8f800bba0445249402b472225a5078.pdf?index=trueIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_6fc4dc72849b43baaa5b6f6a6cd23992.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/66affb46-7757-4c87-b31a-6d22dd2564f4/kubirifenud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/586c425f-c462-4e0d-a1da-90361e87a92d/what_to_do_if_my_smart_tv_wont_connect_to_the_internet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b75732c-d5da-4519-ab80-bb56063c3382/2097095766.pdfIn PDF document text
    • https://7a48fde5-f9d1-4ce4-84a2-8b156d245d18.filesusr.com/ugd/8127dd_e22b249d5b424f1da1df369544fcdd92.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001458e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1458E 5268 bytes
SHA-256: 0676945878d5a3e7dcb366cef441144d181d50af8dfb4dba6a4d13f1bf04aea2
font_01_sfnt_off0001575b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1575B 11284 bytes
SHA-256: fa0955e57d8ffd861e2f43a37821887b835a6c09577903ac340a7459b93bb00f