Malicious PDF — malware analysis report

Static analysis result for SHA-256 37258cd2ab5b1f1a…

MALICIOUS

PDF

78.0 KB Created: 2021-04-27 09:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 875aa86f619b955eed0444873471880e SHA-1: 055a34d413d07422760f347a31f0a76c6877d2e7 SHA-256: 37258cd2ab5b1f1a4e59ba8a90d21a213df6373eb3174f1cc2dd5d5e0e68a544
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as part of a link farm, containing numerous external links, with at least one pointing to a suspicious domain (jumiwimov.ru) that is likely used for phishing or malware distribution. The document's content, though appearing to be about computer hardware servicing, is a lure to engage users with the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=what+are+the+required+tools+used+in+computer+hardware+servicing PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385413/normal_605a6e567df39.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/fABifrX/pebero.pdfIn PDF document text
    • https://cdn.sqhk.co/dewufidabo/mWTfdjg/zofenudepego.pdfIn PDF document text
    • https://cdn.sqhk.co/rotuzuwibi/uhijBie/kilasoluwanovobirepa.pdfIn PDF document text
    • https://cdn.sqhk.co/jisepozidis/icihieP/imo_video_call_free_download_for_iphone_6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410459/normal_5ff7ce1e8f576.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455670/normal_60606937081bf.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/ecg9gd7/vova_application_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382631/normal_5fdb0f96c52fe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_856807068dd94ca1befb681ab98b5f09.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/700494c3-7b96-46d2-8601-8a3c43aa2367/pigurasigew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45f4bc40-a821-4855-9f36-207897166a94/what_does_ref_code_s0a00_mean_for_mediacom.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/87532995971.pdfIn PDF document text
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_7ff06e4188c94f62b20f75c9a376f579.pdf?index=trueIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_e6302541f3a644969cb1f3ab4a93943e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d217dd09-9a0d-4730-b039-2dfaba856f34/dolerunonugiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f22a305f-3d61-4a30-b2f3-28db2d9ae88b/76196633710.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0ce4034-0276-4491-b22d-e9f2ae745bad/87801604158.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2024e2f-250b-4d1a-b3ea-44f6f3e2f5ea/is_keller_williams_worth_it.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/83500148660.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF175 5776 bytes
SHA-256: 43e9a77d36038f189e396adeda6081251ae7f786e92988bd64acd306590982c7
font_01_sfnt_off0001050e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050E 10996 bytes
SHA-256: 453048a253d08837f9c85e1a2f33411417dec910b5b33814a1ae032e953bbb4b