Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28dc6a1c9080019…

MALICIOUS

PDF

74.1 KB Created: 2021-01-04 01:42:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: abdffeaebd34231f927eb97782881bbe SHA-1: 53fe5ca1744c94d03b6fa126f0dc0935641a61db SHA-256: d28dc6a1c908001905f7323e74116429a839bbfaf9d087083e817428d65a4ddf
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this, pointing towards an attempt to manipulate search engine results or redirect users to malicious sites.

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://trafftec.ru/123?utm_term=diamond+wine+rack+dimensions PDF link annotation
    • https://cdn.sqhk.co/dopuwene/Mgfgijg/xikefupo.pdfIn PDF document text
    • https://vamotavobepud.weebly.com/uploads/1/3/1/4/131438348/121217.pdfIn PDF document text
    • https://zufefofavenubu.weebly.com/uploads/1/3/0/7/130775539/7111934.pdfIn PDF document text
    • https://kuwumezebuxe.weebly.com/uploads/1/3/4/1/134131528/8b40b645d85b7.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxawexa/9JKTifT/96989486637.pdfIn PDF document text
    • https://jasuniwe.weebly.com/uploads/1/3/4/5/134515850/fukopas.pdfIn PDF document text
    • https://rozolabo.weebly.com/uploads/1/3/0/8/130814594/c210c2179d3.pdfIn PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/xurejetexu.pdfIn PDF document text
    • https://linowatudevenur.weebly.com/uploads/1/3/4/5/134599813/rewunagi-xikurozuzi-zokegug-nifudo.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/19de37bd-48f7-4000-9990-5cc7701ca58b/33420774375.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baf28a11-e16f-4f22-9e5a-2a87ab3327d9/blackjack_basic_strategy_chart_reddi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c62d626-6d85-4f93-abc0-f98c2c6743e8/31663072525.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/926fef15-377e-40c8-8e27-8f324f29359b/polaroid_originals_stranger_things_itype_film.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_off0000e5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B1 5208 bytes
SHA-256: 111e969d1078760da6a35c38c39326afed2f8572b8cceb6cf0296bb98b7bf0be
font_01_sfnt_off0000f76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76D 10484 bytes
SHA-256: 82f68aa89429a42a67332469f2b5d6fd6e6540ebdfa461e5916eee918be5fc20

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