Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a34a70cfbd10e8…

MALICIOUS

PDF

66.7 KB Created: 2021-03-15 05:32:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fbd90a30104ceec307bf55b8ae200752 SHA-1: 0a4cd090969fed5b39e288d7b590ec5691cf1590 SHA-256: 28a34a70cfbd10e824c6c7d33e60e2f98e485a3cd05bd0c1a2cd6b81e636bfe6
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating it is likely a phishing or malware distribution lure. It contains a large number of embedded URLs, many pointing to potentially malicious redirectors, designed to lead users to external sites. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of numerous links points to a link farm attack pattern.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=cute+love+whatsapp+status+video+malayalam In PDF document text
    • https://cdn.sqhk.co/jememobak/afhcIc2/xebet.pdfIn PDF document text
    • https://riviruzo.weebly.com/uploads/1/3/0/7/130739493/bitepize.pdfIn PDF document text
    • http://prolac.ru/independencia_de_sudan_del_surqjlin.pdfIn PDF document text
    • http://geniusenglish.space/81935168563gvkc5.pdfIn PDF document text
    • https://risixugetiso.weebly.com/uploads/1/3/5/3/135317557/tunugijoxagiz.pdfIn PDF document text
    • http://hhizmet.com/arcana_cleric_guide_5etcn9z.pdfIn PDF document text
    • https://godanikepogi.weebly.com/uploads/1/3/4/5/134509841/dc2e8.pdfIn PDF document text
    • http://ibkreactiva2020.com/68224632339en7uj.pdfIn PDF document text
    • https://jabapimodixo.weebly.com/uploads/1/3/5/3/135314731/8149307.pdfIn PDF document text
    • https://cdn.sqhk.co/nemisova/jmEPuFt/download_dragon_nest_world_pc.pdfIn PDF document text
    • http://itverys.space/checksum._ini_file8vr5e.pdfIn PDF document text
    • https://pedesidava.weebly.com/uploads/1/3/4/3/134355179/perosawesusasi_xevaz_sugupo_xofidemifiwat.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/1e7c7ef2-5a91-4a08-8f56-417235132a90/who_played_the_killer_in_the_green_mile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcf45237-ceb0-44e8-9616-779b75b53605/jifetafuraj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26edab43-9939-4163-815b-3b37a4b16e22/dopobe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a963f7d-1756-4cf0-a578-1f9c557f1c92/woboputitejajajuxumuse.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_off0000ca85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA85 5260 bytes
SHA-256: 12172026f721f941acd4ca0874450221b9ff86b86e5de49bff35797ad5d3b94c
font_01_sfnt_off0000dc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC57 9844 bytes
SHA-256: 328a5ad52137c940c55d90652a3ab7fc8324cea7bc2f10b9478073af4fdcd8f6

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