Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b8916eb9551e7d…

MALICIOUS

PDF

72.5 KB Created: 2021-01-16 10:58:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6d15d37d60d0cc20574e3305388889c5 SHA-1: 98c11137353bf76f8a5d089d3447c7d4eae64ced SHA-256: a6b8916eb9551e7d6dd069cc1a9f304caff3996e850be22e42b2c8334778526d
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many pointing to disposable domains and redirector infrastructure, suggesting a link farm designed to manipulate search engine results or distribute further malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ggtraff.ru/aws?utm_term=material+ui+angular+templates In PDF document text
    • https://dipitamadupod.weebly.com/uploads/1/3/4/8/134882687/xezoxokamepofaxudupa.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/XjhNGif/rankin_bass_christmas_movies_amazon.pdfIn PDF document text
    • https://cdn.sqhk.co/bexamajuw/gjS4Lje/laxovitizafidobatu.pdfIn PDF document text
    • https://cdn.sqhk.co/fiporalisu/gfhgmay/battle_ops_bumblebee.pdfIn PDF document text
    • https://dumopodowejuna.weebly.com/uploads/1/3/4/5/134591879/dddeb451.pdfIn PDF document text
    • https://raxopukefafifi.weebly.com/uploads/1/3/2/6/132695755/sumuri.pdfIn PDF document text
    • https://wisefumi.weebly.com/uploads/1/3/4/6/134672277/vabim_gitonuvimigi_fatutolas.pdfIn PDF document text
    • https://wegupufula.weebly.com/uploads/1/3/0/8/130813429/mimuxeboxaxulu.pdfIn PDF document text
    • https://site-1174307.mozfiles.com/files/1174307/war_world_tank_2_hack_mod_apk.pdfIn PDF document text
    • https://rukudigef.weebly.com/uploads/1/3/4/6/134642400/zumuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/sunabod.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/semebolomifiluwa.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/36672251573.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_off0000ded3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED3 5144 bytes
SHA-256: c892f70064c7a6fa751cdbb72ebe3354fac6a2993fec6353ef5215be1a37d27e
font_01_sfnt_off0000f048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF048 10764 bytes
SHA-256: 759cd7c6ed049d8f1295ff4e539f5abfd4bf8c5a1ac9ca04cb307e3d5efce619

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