Malicious PDF — malware analysis report

Static analysis result for SHA-256 6614175c0c216fa7…

MALICIOUS

PDF

113.5 KB Created: 2021-03-17 22:50:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5575adb5a5b08a6f281b6e11602cbdf8 SHA-1: 7758725c77afbb6f0e7c2e9d0ab3d5d90201cb19 SHA-256: 6614175c0c216fa7697526d9fc8ae30a5e232423056377ea50c4bea8fc0f6d7e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bologen.ru/123?utm_term=cysteine+forming+disulfide+bonds PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446379/normal_6019be954272b.pdfIn PDF document text
    • http://douchehq.xyz/patton_heater_puh680_not_workingbuwg5.pdfIn PDF document text
    • https://vipoferizapil.weebly.com/uploads/1/3/5/3/135346342/6409440.pdfIn PDF document text
    • https://xikunamoveg.weebly.com/uploads/1/3/4/5/134596382/6948256.pdfIn PDF document text
    • https://cdn.sqhk.co/zatovafer/hcichgL/45316067743.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390660/normal_603ab94bcb092.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450628/normal_601295266ee2b.pdfIn PDF document text
    • https://fabodafulunulof.weebly.com/uploads/1/3/4/3/134372089/cfb58f.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/WgtXieQ/42605047417.pdfIn PDF document text
    • http://befigter.xyz/how_much_can_a_3_ton_jack_liftgb6ip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_a2c646c82f234f8f9807bbc00e4e4903.pdf?index=trueIn PDF document text
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_458c42808b9f4f9180722ece99b89ebe.pdf?index=trueIn PDF document text
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_f5593587076540c99ad06982ee35a200.pdf?index=trueIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_5dfc36e3af274b4f89337ae67422a40e.pdf?index=trueIn PDF document text
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_cd56dec887b34b99b179f18573462962.pdf?index=trueIn PDF document text
    • https://c78ffd2e-fc3d-4272-86ca-968d835fb7ad.filesusr.com/ugd/0f9ef0_10866003e6874ead8e371edf729dbca9.pdf?index=trueIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_db11abd1a9364e2dbec2b7afe37b1957.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73F 37868 bytes
SHA-256: c73b4a026333327449feacc3c1a4e5c04080e829f9eb9f1db37e14442bcc629e
font_01_sfnt_off00015bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BC8 5164 bytes
SHA-256: cf1f4864fd3998294a11b77d33d11aa748ab511f3ead862deeebdacb6ac6473f
font_02_sfnt_off00016d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D44 10860 bytes
SHA-256: 1532026f54cc40ba8233749e542f293e1d9f6d140b5739c2fd53e1032f68b212
font_03_sfnt_off00019255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19255 16316 bytes
SHA-256: 07e584025dd5e4d7f26dc4584f89c9ad6c30dd256667226c316a53fa5d54a61d
font_04_sfnt_off0001a810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A810 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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