Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bcb6b827bb0892f…

MALICIOUS

PDF

85.8 KB Created: 2021-06-08 20:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a0b870626e4656654e555057320e8483 SHA-1: 29b81396c98bd8c58ec022da4208f99ffd926fcd SHA-256: 3bcb6b827bb0892f909e9b84989c6835760770a116898f00c8d55c8162203df9
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://archism.ru/pbw?utm_term=1tap+cleaner+pro+apk PDF link annotation
    • https://rosafuzumago.weebly.com/uploads/1/3/1/8/131857847/refubonotisa.pdfIn PDF document text
    • https://keziputaxa.weebly.com/uploads/1/3/2/7/132711938/kopogem.pdfIn PDF document text
    • https://sifofazawovetix.weebly.com/uploads/1/3/0/7/130776166/putupuxawaxeju.pdfIn PDF document text
    • https://zuxibonidape.weebly.com/uploads/1/3/4/8/134889984/25cab983abe87.pdfIn PDF document text
    • https://segovukejogudu.weebly.com/uploads/1/3/7/5/137514481/984d9f1dbf.pdfIn PDF document text
    • https://ruxosegid.weebly.com/uploads/1/3/4/2/134265817/nupazanidexe_fegigiluzovivu_baravinavuxi_vowajemo.pdfIn PDF document text
    • https://nulesurusisozi.weebly.com/uploads/1/3/4/7/134744420/44d3805.pdfIn PDF document text
    • https://jufomefafuxujo.weebly.com/uploads/1/3/4/8/134890319/nisivid_xawuzofapigo.pdfIn PDF document text
    • https://zunodeni.weebly.com/uploads/1/3/1/0/131070331/6464099.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0903eec3-5e76-4d17-a260-01fdef0d5069/54465998271.pdfIn PDF document text
    • http://biduzoku.pbworks.com/w/file/fetch/144614154/medical_ethics_multiple_choice_questions_and_answers.pdfIn PDF document text
    • http://fafevupu.pbworks.com/f/14277885020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4697f223-2167-46f9-a6e2-18af2a7ca2f7/logitech_g700s_replacement_receiver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27e485d2-9f48-4cf5-a401-0c459e947164/kitchenaid_professional_6000_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fa5f911-45d1-44fb-a301-6d66bb760b8b/jeraj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1fd9415-7bc7-4d45-89eb-bc3a9b7bc441/mia_and_sebastians_theme_tab_guitar.pdfIn PDF document text
    • http://liwuvedesisu.pbworks.com/w/file/fetch/144484419/85617444054.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bb26772-d617-4148-80be-7bd53b3d57c4/51807500338.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7408adff-b1c1-4395-8717-d38dc9558eb0/essae_weighing_scale_calibration_procedure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb5864a1-2267-4d91-9787-88041d48c4b7/fipireposob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/755b65df-1c4a-4e07-85a3-bd00298a250a/rinuwevijijifirak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe2141fe-1ce3-425d-bfc6-6010adfa27bb/citizen_e650_strap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd8d830f-6507-4749-9e16-98824a7a030d/hay_day_mod_apk_private_server_2020.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
    • 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_off0000ea47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA47 3468 bytes
SHA-256: 9eab8517f618f009ca968b4d124fd2c6e73d016ddf75b704f48f3bbf3273d064
font_01_sfnt_off0000f6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B1 4772 bytes
SHA-256: 6c2d493524d755b429359ea73823da6d90a60c1536da9a21d74c0817d5b57cbe
font_02_sfnt_off000106fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FD 14688 bytes
SHA-256: 551311f3447a5040dfec3da7cac926a82bdb282501552357f36799824c619838
font_03_sfnt_off0001344b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344B 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2