Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ecf78f515389c8…

MALICIOUS

PDF

74.4 KB Created: 2021-05-19 16:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e72859b34ed9ae5ee282dc5b5559bde6 SHA-1: a665e4e9045984362c30c626dd5aa3e05166243f SHA-256: 90ecf78f515389c8cd5f2750020c9f518e156c696cdb02bc24a660419217cdfb
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable hosting, and includes a URL with a 'coin master cheat codes' term, suggesting a lure for users seeking game cheats. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a link farm used to redirect users to malicious sites.

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
  • 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://maypoin.ru/strik?utm_term=coin+master+cheat+codes+iphone PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467298/normal_6067806bae29a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499636/normal_5ff0166f376e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450154/normal_5ff590763dbc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447915/normal_5fda6d9cc82b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382972/normal_6067220b6828c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454678/normal_6018688807a35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470231/normal_602736ff9a6aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385424/normal_602f28f2cbb20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415770/normal_6006f5a02bd23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373004/normal_602be39118f55.pdfIn PDF document text
    • https://bojibelatos.weebly.com/uploads/1/3/4/0/134040608/wagudunoti-jogap-godamajekumafiz-viwagaxunezub.pdfIn PDF document text
    • https://rarejiwu.weebly.com/uploads/1/3/1/6/131606055/wevivinozanuvijug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488572/normal_5fd2dd9bd4671.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370319/normal_6037c014eeb46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459788/normal_5fc9e97f56799.pdfIn PDF document text
    • https://jejomedilad.weebly.com/uploads/1/3/5/3/135316302/ruzinitug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388827/normal_5ffaa30e3640e.pdfIn PDF document text
    • https://gabegolixen.weebly.com/uploads/1/3/4/3/134368455/1783696.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/542a089b-b7bd-40e6-8836-03d9ef6889fb/powuzupow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69fd0a9d-c908-4599-8849-06b0349080d1/loguvusani.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/76688585553.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dcc9111-eb0c-4be9-9904-592591e6776b/how_to_crochet_a_blanket_with_thick_yarn_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/what_mammal_has_the_least_chromosomes.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/22665221899.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/27913321729.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_off0000e4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E9 5184 bytes
SHA-256: a8e21ead084705e0f3ab28a047fdb4ad4e2eb6aa16b0d87215901c18cf224d8e
font_01_sfnt_off0000f650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF650 11020 bytes
SHA-256: c83ba7e7ed76404ffee3b451d9a7c86020931c6c274c2f8a900ba062964067aa