Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3baab4e2a81c32…

MALICIOUS

PDF

77.8 KB Created: 2021-03-08 20:46:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 4c5a5a0bc93ac570795ffc5fe2dfba42 SHA-1: 54a504b167117504834c08d6f5ef8d204bc85f9b SHA-256: 3f3baab4e2a81c3292227873feb98e7f707315c56122598ca65e4b048acd92d9
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded links to external resources, many of which are hosted on disposable domains and some are identified as malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The document body itself is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, not a typical user-created document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=tratamento+da+anemia+megaloblastica+pdf In PDF document text
    • http://mexicotop3.xyz/bolens_g152_tractor_seatm52q4.pdfIn PDF document text
    • https://cdn.sqhk.co/bopesajan/QhejbaS/lara_croft_relic_run_apk_mod_data.pdfIn PDF document text
    • https://cdn.sqhk.co/daxutoxod/hPjdjgO/abba_knowing_me_knowing_you_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/nezazexador/hsghhie/28831491576.pdfIn PDF document text
    • http://naturwows.space/7073571494674f16.pdfIn PDF document text
    • https://cdn.sqhk.co/fipimomozuk/Q3oSlii/ditokodurixogedefotefu.pdfIn PDF document text
    • https://cdn.sqhk.co/wekajibex/ggonPdh/54080781029.pdfIn PDF document text
    • http://look-hotel.com/example_of_capstone_research_paper98a1r.pdfIn PDF document text
    • http://lg-copyrightforms.com/sojepinitajoxawukogrisj.pdfIn PDF document text
    • http://cmb-accueil.com/age_of_empires_2_hd_the_forgotten_campaignsxpdfi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ad9f1622-e3b7-49db-bfef-326c48fb2104.filesusr.com/ugd/a467d2_72dfe52da2b94df5b04874fa7df21fd5.pdf?index=trueIn PDF document text
    • http://nibewisule.epizy.com/acapella_apk_android.pdfIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_4cd727b88d894782b4bda5d490a99ac6.pdf?index=trueIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_3d5293cc73a046e7903f4dcf333bd7d1.pdf?index=trueIn PDF document text
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_53d29a6f77d44f559bfffd1ae5a2981d.pdf?index=trueIn PDF document text
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_4a1fcf298a5c4d90a2a9cc3b5a62a519.pdf?index=trueIn PDF document text
    • http://dadokupokumudav.rf.gd/96907054853.pdfIn PDF document text
    • http://zorufuzelal.rf.gd/71653583262.pdfIn PDF document text
    • http://gofirog.epizy.com/attivare_android_auto_fiat_tipo_2017.pdfIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_050627822622486c8694825c48e59ff8.pdf?index=trueIn PDF document text
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_58f54e4645cf4879a561d09ca87c473a.pdf?index=trueIn PDF document text
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_857740f6a30f4a9e9c6fc82237e3f8d5.pdf?index=trueIn PDF document text
    • https://9cc02d22-446e-415d-9686-6e49aadcb3b3.filesusr.com/ugd/aa6a08_4f8e46fe0271444daae58d5fa2ec0732.pdf?index=trueIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_89d05e123ae84da2b1701b34a2104631.pdf?index=trueIn PDF document text
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_1b3622a4254e474097ca69bc8e3e155f.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_off0000f0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D3 5564 bytes
SHA-256: 3fc64b75db894318a86db289722f58548dd63139bdd7f200b1d8de8a1ee0cc68
font_01_sfnt_off000103a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A2 11672 bytes
SHA-256: c69d83243848f22aa079e958ed393e53ccbcad9d897c3b450112ea051609807a

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