Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4052ef7e29cddf3…

MALICIOUS

PDF

84.5 KB Created: 2021-04-07 14:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2d13d4a51ec1f81db0d8d55c3cdfa6a1 SHA-1: dbb5fb97bb87372662e9d131a81726de00c7b2b1 SHA-256: d4052ef7e29cddf37300b6fd382f2fd4c0f2ed196198e011e196bf3fdde1e4c9
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to direct users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ponafet.ru/123?utm_term=bogleheads+guide+to+the+three+fund+portfolio PDF link annotation
    • https://cdn.sqhk.co/pagupuxu/a6hbyge/96020067672.pdfIn PDF document text
    • http://bukupiduge.mypressonline.com/goziwezaxotiduzavit.pdfIn PDF document text
    • https://cdn.sqhk.co/netimawifes/ihxQ0dX/hits_radio_brand_network.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456376/normal_5ff158cd21b9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454682/normal_6041de649d605.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490524/normal_5fdef35f24c64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484115/normal_60401d515db3b.pdfIn PDF document text
    • https://cdn.sqhk.co/tubadaluzafu/emgjhhi/arealive_search_find_and_locate_events_near_you.pdfIn PDF document text
    • http://jebebixazonutug.mypressonline.com/historicism_in_linguistics.pdfIn PDF document text
    • http://sifinujox.sportsontheweb.net/3334110178.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/hbgihez/94282717045.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368477/normal_6055100c12bcf.pdfIn PDF document text
    • https://cdn.sqhk.co/sesijisova/bgfifjj/sodunilojafonak.pdfIn PDF document text
    • https://cdn.sqhk.co/jemitaso/Hihgcii/slam_dunk_festival_2021_lineup.pdfIn PDF document text
    • https://cdn.sqhk.co/toridezoxiko/orMPgec/international_business_degree_job_prospects.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_4881b122e0504ffc8b327ac58508d96e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tobaziw/zewarozijategijatufofuzok.pdfIn PDF document text
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_ed25fce415064a18be90c396ba1a1d93.pdf?index=trueIn PDF document text
    • http://wumugajus.onlinewebshop.net/84737350537.pdfIn PDF document text
    • http://xunudijumo.myartsonline.com/audit_trail_example.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/8166022030.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/51723962073.pdfIn PDF document text
    • https://d7b50aa0-fea3-4edc-ba9e-4ed0094b0c60.filesusr.com/ugd/7f614e_b5224d87b15e49ca89d8ce46f808b059.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA84 5236 bytes
SHA-256: 08d80e017c5ef265db4fcce52a4e5eac5d5818c98a8300f5c3bfed50f701567b
font_01_sfnt_off00010c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C44 11768 bytes
SHA-256: 1128b6fb9a22dfad23abec19fa77101c12f15077019f0e55d993b76cf3befab2
font_02_sfnt_off00013496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13496 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3