Malicious PDF — malware analysis report

Static analysis result for SHA-256 d762b72e233c2106…

MALICIOUS

PDF

78.4 KB Created: 2021-03-31 02:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 792c4c8cb970daccdd2867873efacfeb SHA-1: aee9c4ff0d7b3d5494b3dbb2440090bd6a7a0531 SHA-256: d762b72e233c2106e83af51e09052bfebf7143e3f355a34580a74b14ac119bf6
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The embedded content, though heavily obfuscated, likely serves to redirect users to these malicious URLs.

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://golowaki.ru/strik?utm_term=how+to+tune+up+a+homelite+leaf+blower PDF link annotation
    • https://cdn.sqhk.co/wetilusogaki/fHGkMhi/elements_of_carbs_lipids.pdfIn PDF document text
    • https://cdn.sqhk.co/mamevugixej/cFibigc/niwutebake.pdfIn PDF document text
    • https://cdn.sqhk.co/pesenexur/jcgdria/solitaire_ring_with_eternity_wedding_band.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466135/normal_5fc6bc9ce7cb1.pdfIn PDF document text
    • https://cdn.sqhk.co/guranotup/jW95igc/train_taxi_apk_hack.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482863/normal_60120a6951588.pdfIn PDF document text
    • https://cdn.sqhk.co/pujapipiwat/miivihu/99202661299.pdfIn PDF document text
    • https://cdn.sqhk.co/soziwariru/Eibidia/what_does_the_bible_symbolize_in_shawshank_redemption.pdfIn PDF document text
    • https://cdn.sqhk.co/bajowekununa/Hl5gGjd/polaroid_originals_stranger_things.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409798/normal_5fcdffdc9fc5d.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/e87a6f41-ab4a-4f1c-a06c-a38c6d43859d/76451880854.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0105cad7-0844-4027-acae-74fc2bf51d50/papalofoboviduvaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/299efffa-f397-4eb5-8e9e-f493d2cbc457/how_to_get_your_permit_in_mass.pdfIn PDF document text
    • http://nexovototato.epizy.com/25096561617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32ff1a67-a892-4ecb-b574-1c5015a1be02/68473286776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e7ee355-0c95-470b-a62c-009a184dc5f5/16563305265.pdfIn PDF document text
    • https://6552665f-f3ce-4070-9f47-7b493df4570a.filesusr.com/ugd/3d88c7_e0c2b79e1f4547aa916f3afd91a219c7.pdf?index=trueIn PDF document text
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_de6c456bb2ac4e9dacb919306ff57a65.pdf?index=trueIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_f18bb1a66b5a46c483a0208035e825f5.pdf?index=trueIn PDF document text
    • http://zobidixit.epizy.com/muay_thai_beginner_tips_reddit.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_off0000f528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF528 5156 bytes
SHA-256: e921ef1c7e3b253a9b64a84f887f232e2411d137c63fe33610dc5c6879384e89
font_01_sfnt_off00010696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10696 11076 bytes
SHA-256: a586a9aca8c014a7cb020fee1da4b76094974725c132180f8182e049b8fc451b