Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc07fec25382f494…

MALICIOUS

PDF

76.5 KB Created: 2021-02-26 04:18:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4a0109d544c10bdc61f70fbf0fc06ae4 SHA-1: 07ac0cde3334d702a8d8b69f3b9bfb49f0b227fc SHA-256: bc07fec25382f494b266cc351428b8e3a0b5535b67e56cd309ad5249f6a5af7d
126 Risk Score

Malware Insights

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

This PDF document is classified as malicious due to its structure and embedded URLs. It functions as a link farm, directing users to numerous external sites, many of which are hosted on disposable domains. The document body, though heavily obfuscated, appears to contain search query-like text, suggesting a tactic to attract users through deceptive content. The ML classifier strongly indicated maliciousness, and the presence of a large number of external links, including one on `epizy.com`, points to a spam or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://jacksth.ru/strik?utm_term=what+exercises+are+good+for+neck+fat PDF link annotation
    • https://cdn.sqhk.co/niwonosorude/aXshcBU/kuwifaguduzabejopimalap.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxosutuku/iiKmghz/12016471298.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/NVZwPhh/hang_glider_not_strapped_in_switzerland.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/jhdgdhb/sisalojowuwozipigabepiru.pdfIn PDF document text
    • http://autocredit.moscow/wogapivavovatasokomivey7.pdfIn PDF document text
    • http://clobuss.ru/aambala_songs_audioh27ry.pdfIn PDF document text
    • https://belanuxaru.weebly.com/uploads/1/3/4/6/134670531/tefejumosevubuv-zikorafazoj-vasivipelefesar-gupowog.pdfIn PDF document text
    • https://cdn.sqhk.co/rabuvimi/sqpRHhg/56147684774.pdfIn PDF document text
    • https://rofexigu.weebly.com/uploads/1/3/0/7/130738805/dusibekafu_mudumasomoti_bexigajuveg.pdfIn PDF document text
    • https://cdn.sqhk.co/damapegapi/OicieNb/bapevasupibuto.pdfIn PDF document text
    • https://zajinepimasi.weebly.com/uploads/1/3/2/8/132815118/zomod-kiramubumad-warifulezov.pdfIn PDF document text
    • http://axacheat4.xyz/download_sx_os_betar6smi.pdfIn PDF document text
    • http://subonus.ru/tisozomarobikuwolegemermps2i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://powejuzusar.epizy.com/fevewusi.pdfIn PDF document text
    • http://zezatavaveb.epizy.com/are_front_load_washer_pedestals_universal.pdfIn PDF document text
    • http://fozixomu.epizy.com/how_to_take_night_photos_with_nikon_d3500.pdfIn PDF document text
    • http://punonawu.rf.gd/48098321923.pdfIn PDF document text
    • http://vabizofolimise.epizy.com/52092783878.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF90 5396 bytes
SHA-256: 1cccd092da49eda96e65539a46f4e053408522caa82508bb14cea4506d573276
font_01_sfnt_off000101fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FA 10184 bytes
SHA-256: bd3c22af5283e0e0b4747b5a43499f3770e2fe78c1752cb4b613971fb7544df7

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