Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e809a81b4ec167…

MALICIOUS

PDF

69.8 KB Created: 2021-05-24 19:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: cfe2d07954a9b1b2182903c5b41bec55 SHA-1: 23b8207dd387022b4833d91564aadbefc21559c8 SHA-256: f1e809a81b4ec167798476d43449ee3163649b280cf57febe419845d284e0948
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The 'Meccano junior car instructions' title in the document body is likely a lure to direct users to malicious or deceptive websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=meccano+junior+car+instructions PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4378605/normal_5fdd9224f3c75.pdfIn PDF document text
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/855b6cac.pdfIn PDF document text
    • https://venireza.weebly.com/uploads/1/3/5/9/135959939/2431168.pdfIn PDF document text
    • https://nigupisotaku.weebly.com/uploads/1/3/4/3/134374455/6973043.pdfIn PDF document text
    • https://fisujokogawubi.weebly.com/uploads/1/3/2/7/132711991/8e680c2dd2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411923/normal_5ffe8a8e972e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446649/normal_6027216423524.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365583/normal_60622ea39aea1.pdfIn PDF document text
    • https://balebapu.weebly.com/uploads/1/3/5/3/135322653/vowak_xogajopikineka_pegaxizuzugi.pdfIn PDF document text
    • https://keladita.weebly.com/uploads/1/3/0/7/130739570/jenotoripu.pdfIn PDF document text
    • https://zomerasojukoluw.weebly.com/uploads/1/3/4/7/134769652/vewexakid.pdfIn PDF document text
    • https://jixusalozexifan.weebly.com/uploads/1/3/1/4/131407855/bisasapakilip.pdfIn PDF document text
    • https://fepuguraxetud.weebly.com/uploads/1/3/7/5/137512182/4954470.pdfIn PDF document text
    • https://somirurawepaf.weebly.com/uploads/1/3/1/3/131381963/117085.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/bd9d0d51-e790-4128-b824-832426eda1ab/flower_of_life_chiropractic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc681f4d-9f57-48f0-ba9a-b36acfe8b194/how_to_program_hampton_bay_transformer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdfda9d4-9351-45ac-8562-823593bb7683/cat_in_the_hat_baby_halloween_costume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01b18fd2-06b2-4f9a-a4b2-2140fa89a60e/how_much_do_sprinkler_fitters_make.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb0a1ea0-3932-42fe-a30a-3364cc094031/nadibejekejenajerovunufa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d749ad7a-8d8b-4789-a802-b115e40ff5c0/how_to_unfreeze_ice_maker_line.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_off0000d585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD585 4840 bytes
SHA-256: 8879135676803caf49e79036ae3e18e91502216307bc0b0a7c316cc691be12d7
font_01_sfnt_off0000e617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE617 10600 bytes
SHA-256: a612de05cfbf65ab796ae26756616935ad8a8fbc3c483acecf4154ccbe363e1b