Malicious PDF — malware analysis report

Static analysis result for SHA-256 1901dc4c24c98fac…

MALICIOUS

PDF

131.2 KB Created: 2021-03-28 01:18:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9fe668995723465e506126551d824831 SHA-1: dc5f112dcb456064fea9e0d48b4c7116e56ab335 SHA-256: 1901dc4c24c98fac267f45ac2c2723f7362dbf838dd9fecbf3b4e77a7ad42596
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with many hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate maliciousness, consistent with phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs 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://xezojetit.ru/wix?keyword=dnd+blood+hunter+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412909/normal_605f00a426147.pdfIn PDF document text
    • https://cdn.sqhk.co/dikabopagesi/kjeZZ65/restaurant_story_2_cruise_recipes.pdfIn PDF document text
    • https://jufozawuvinuxak.weebly.com/uploads/1/3/5/3/135326647/duzegiduvotegamu.pdfIn PDF document text
    • http://goproonly.com/what_is_meant_by_deterrence5hfcb.pdfIn PDF document text
    • https://majujeleku.weebly.com/uploads/1/3/4/5/134590665/2433134.pdfIn PDF document text
    • http://guromufupadaf.iblogger.org/chemistry_if8766_metrics_and_measurement_answers.pdfIn PDF document text
    • https://jabakatuni.weebly.com/uploads/1/3/1/0/131071057/bewafugofiwoforuda.pdfIn PDF document text
    • https://fukidupedogof.weebly.com/uploads/1/3/2/8/132814182/xifasunumojara.pdfIn PDF document text
    • https://papafamibupa.weebly.com/uploads/1/3/0/7/130775965/mamenivatawo.pdfIn PDF document text
    • http://stepka2016.xyz/family_tree_template_excel_spreadsheetoaczz.pdfIn PDF document text
    • https://lazevipabeba.weebly.com/uploads/1/3/4/7/134712462/litezupowinaze_narujemoxuzo_pidoximuraridom_birutexudefas.pdfIn PDF document text
    • https://cdn.sqhk.co/tovasodoj/jhIjfge/tengai_shinsei_hand_signs.pdfIn PDF document text
    • https://filukekab.weebly.com/uploads/1/3/4/4/134478490/6221493.pdfIn PDF document text
    • https://minadefimufev.weebly.com/uploads/1/3/4/6/134635785/biwejozux.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/cjajhgg/96268999898.pdfIn PDF document text
    • http://bitjoms.xyz/golden_song_lyricsy4212.pdfIn PDF document text
    • http://on-arenas.com/alexander_alekhine_my_best_games_of_chess9doon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495684/normal_601fb7fd55717.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tipujujidudig.rf.gd/what_happened_to_juliane_koepcke.pdfIn PDF document text
    • http://fabonek.rf.gd/cinematic_action_music_free.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_off0001ca64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA64 4936 bytes
SHA-256: 674dcf6bf11b91f663eef77db601a841555fe1b2e26ba5fb9ef2e1fa58366a45
font_01_sfnt_off0001db22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB22 10664 bytes
SHA-256: cf1df6a05f6dabe62a459fb6f2978cb95136bce8c235b8910808635d87bcf057

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