Malicious PDF — malware analysis report

Static analysis result for SHA-256 d338fb1e1e41193e…

MALICIOUS

PDF

68.6 KB Created: 2020-12-20 23:50:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e8256889edd49fbd970b79506b50c188 SHA-1: 900f8366317e32c79f03e349403315a9b029d9b3 SHA-256: d338fb1e1e41193ec40aa5cdb678b0199ee9fd5299cab41da13938d4ffe55c90
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffine.ru/strik?utm_term=slots+lv+bonus+codes+no+deposit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367937/normal_5f978cc3a7e81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447631/normal_5fd10bf0764bb.pdfIn PDF document text
    • https://pitadamep.weebly.com/uploads/1/3/4/8/134886808/nipabidafuj.pdfIn PDF document text
    • https://tilakajunobeka.weebly.com/uploads/1/3/0/7/130739719/45d993d.pdfIn PDF document text
    • https://jamakebowixon.weebly.com/uploads/1/3/4/4/134477175/fd3f53a7f2a5760.pdfIn PDF document text
    • https://rupevegix.weebly.com/uploads/1/3/4/8/134887155/degovomikifomif.pdfIn PDF document text
    • https://tozupolut.weebly.com/uploads/1/3/0/9/130969077/45e537f35a.pdfIn PDF document text
    • https://sakafafemowuva.weebly.com/uploads/1/3/4/6/134694971/3e72d29390.pdfIn PDF document text
    • https://tekemuwuva.weebly.com/uploads/1/3/0/7/130775778/nadefazunaxefiwonedi.pdfIn PDF document text
    • https://sowimarigakuni.weebly.com/uploads/1/3/4/7/134705136/59bf910954f.pdfIn PDF document text
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/sesakaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fdd5508eb685147a09c9c9e/t/5fde7e442baf317dc39539b2/1608416836707/traditional_nursery_rhymes_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/texifaxepag/english_vinglish_full_movie_online_dailymotion_part_6.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4b90bc819f1cf4ced185/1606372242231/best_buy_cordless_phones.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_off0000ce00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE00 5064 bytes
SHA-256: fd9ea7668384e8411979cc93286eac23895d3a0a8ef8ef27cb02d6bce20611d6
font_01_sfnt_off0000df50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF50 10784 bytes
SHA-256: f84682b03976cc8faff66b61bac87077a01ec7393341e8f738c60075dfd1f85b

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