Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e771f5c09982616…

MALICIOUS

PDF

77.1 KB Created: 2021-04-17 00:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 17465a8b2bebb925708ec7372915aead SHA-1: 544c82fc8be2b38238452f84122b379ff71c0084 SHA-256: 8e771f5c0998261613f32fb088dbf271146d79db8b2d06d9009e77df914aae4f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and hosted on services like sqhk.co and weebly.com, indicating a link farm designed for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/strik?utm_term=what+is+the+difference+between+descriptive+statistics+and+inferential PDF link annotation
    • https://cdn.sqhk.co/tovipovo/jb27jdm/xepokimidugab.pdfIn PDF document text
    • https://cdn.sqhk.co/jutigurotow/4ajgm1r/texas_holdem_poker_on_facebook_not_loading.pdfIn PDF document text
    • https://cdn.sqhk.co/xuluriwu/giaXjjx/vapojit.pdfIn PDF document text
    • https://rarejitidod.weebly.com/uploads/1/3/5/9/135993923/09cc56c1a1875b.pdfIn PDF document text
    • https://cdn.sqhk.co/nesadatifu/jDOcXEJ/70888392343.pdfIn PDF document text
    • https://cdn.sqhk.co/gizoxemovefi/SMpS8ie/herpes_simplex_10_quote.pdfIn PDF document text
    • https://gejipowuxenufo.weebly.com/uploads/1/3/4/6/134681439/b439b1.pdfIn PDF document text
    • https://cdn.sqhk.co/faroziwe/ctGBfhj/85416811641.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvaratuji/hjqDhfs/xisilizawarupozod.pdfIn PDF document text
    • https://cdn.sqhk.co/xaripisi/VegiAje/8260897735.pdfIn PDF document text
    • http://sudedelanefozuk.66ghz.com/applications_of_ion_exchange_chromatography.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wusojomirewo.epizy.com/dd_5th_edition_paladin_guide.pdfIn PDF document text
    • http://bavipilebevim.epizy.com/angielski_sownictwo_techniczne.pdfIn PDF document text
    • http://japivolenalu.epizy.com/zosedanug.pdfIn PDF document text
    • https://3abcc933-4059-444f-8e65-7077e95f005f.filesusr.com/ugd/44645f_bed9e95c319b4ba199b00c7782d98993.pdf?index=trueIn PDF document text
    • http://sasusijuxekexo.rf.gd/gufefilexamobewat.pdfIn PDF document text
    • http://vobumubuto.rf.gd/8598051705.pdfIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_9158a4615ea247dfa4647b98554fe98b.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_off0000efc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC2 5548 bytes
SHA-256: 8e24e0aa821511be5069381916b93557a5b795a5bba6161cc1fe867127850486
font_01_sfnt_off000102b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B3 10600 bytes
SHA-256: 8e751f99ea39c73150a6912784f3b94f9e129c100c41157e6bf07b432a20b465

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