Malicious PDF — malware analysis report

Static analysis result for SHA-256 7592d18804fb4cf3…

MALICIOUS

PDF

93.1 KB Created: 2021-05-03 20:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 66b148ce798c8674a66fb2f958ec401b SHA-1: e7bf7580abe1b662e902ca99303f31fa20361aa3 SHA-256: 7592d18804fb4cf305ecd12fec00962be3125430fcf62a3d311164346fc0d9eb
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external URLs pointing to other PDF documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO manipulation. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://druttle.ru/strik?utm_term=iso+22000+standard+purchase PDF link annotation
    • https://cdn.sqhk.co/bumogebiz/hjiziev/bubble_witch_saga_3_online_spielen.pdfIn PDF document text
    • https://cdn.sqhk.co/tuforalogidu/icggKje/minerals_in_granite_thin_section.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393029/normal_5fc95b2a5ac29.pdfIn PDF document text
    • https://cdn.sqhk.co/lefuwaregew/cgdhjs8/herbalism_guide_wow_tbc.pdfIn PDF document text
    • https://jefaxuler.weebly.com/uploads/1/3/0/7/130775921/2818097.pdfIn PDF document text
    • https://cdn.sqhk.co/rawerusiwala/wiakifq/9192114196.pdfIn PDF document text
    • https://sodapovi.weebly.com/uploads/1/3/4/4/134494820/5701168.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459792/normal_60269af2a68d6.pdfIn PDF document text
    • https://cdn.sqhk.co/susononuz/Fgciggh/44372644137.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488346/normal_6005a3b59938a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448744/normal_6024b7d1267e0.pdfIn PDF document text
    • https://dowisapi.weebly.com/uploads/1/3/4/2/134266119/1841383.pdfIn PDF document text
    • https://cdn.sqhk.co/karapazepot/I3gjRL0/diamond_cut_rope_chain_vs_regular.pdfIn PDF document text
    • https://cdn.sqhk.co/guzelatolina/iihOgMQ/goxuzasatoxek.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/ejfaLjf/elevate_brain_training_app_free.pdfIn PDF document text
    • https://cdn.sqhk.co/bazexolareja/hfhbicJ/fitbit_versa_3_black_friday_2020_canada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369923/normal_605f96f5418ff.pdfIn PDF document text
    • https://mizefubu.weebly.com/uploads/1/3/4/6/134637235/lapivarituwi-kedijexedaruka-teledex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403407/normal_5ffa23f42d894.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378641/normal_603aec32a731d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487399/normal_5fd9151060ceb.pdfIn PDF document text
    • https://cdn.sqhk.co/kigoxeni/hcOgdt9/92928174622.pdfIn PDF document text
    • https://lezafopiga.weebly.com/uploads/1/3/4/6/134628758/4f6a5172.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465149/normal_5ff01da7b0d34.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_5cf91ea127ee4e26a58bf709896708dd.pdf?index=trueIn PDF document text
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_53b47d5734bf42848c6517e5269c75bd.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_off0001274b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274B 5340 bytes
SHA-256: d10ac99763bc61bcee3ee68aa317f30df43f611bd6c976eddefa03b45f4a7d41
font_01_sfnt_off0001396f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1396F 14244 bytes
SHA-256: 8595af34b30f586d8f93cffb073c29853bacdec63b44af3a4184b49076f9ab38