Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d795bfd591dc16…

MALICIOUS

PDF

80.8 KB Created: 2021-01-29 06:45:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 821457a295d1e45db75942986180de68 SHA-1: bedbdf097a29ec1773c59fa979562ef4e44961ce SHA-256: 72d795bfd591dc164f4fb621a404cce0d445be3f42d68358cb416c48e77d64da
126 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous external URLs embedded within it, disguised as a 'Texas commercial driver license manual'. The ML classifier strongly indicates maliciousness. The presence of multiple disposable hosting domains and UTM parameters suggests an attempt to manipulate search engine rankings or distribute malicious content through deceptive links.

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://baarspo.ru/123?utm_term=texas+commercial+driver+license+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473654/normal_600d0b013cce2.pdfIn PDF document text
    • https://cdn.sqhk.co/jumupebuvi/aphdqUX/magos.pdfIn PDF document text
    • https://cdn.sqhk.co/vumivatuvi/ibvE2ja/yellowstone_season_1_episode_2_recap.pdfIn PDF document text
    • https://cdn.sqhk.co/muwazubivotu/fnOrjav/76873308013.pdfIn PDF document text
    • https://cdn.sqhk.co/gikunixa/cfjj2gh/acrylic_nails_coffin_shape_ombre.pdfIn PDF document text
    • https://cdn.sqhk.co/lebogomatoze/0NicX5q/rovowobenobivekul.pdfIn PDF document text
    • https://lewibodozibepa.weebly.com/uploads/1/3/3/9/133997785/3000813.pdfIn PDF document text
    • https://muxiduxipa.weebly.com/uploads/1/3/5/3/135319221/7692235.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383680/normal_5fcd385cb991e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470224/normal_5fd70942a3078.pdfIn PDF document text
    • https://cdn.sqhk.co/zupodejadofe/jLKKjjh/wizened_meaning_in_marathi.pdfIn PDF document text
    • https://cdn.sqhk.co/zupitefa/bhaicji/free_online_shopping_australia_all_in_one_apple.pdfIn PDF document text
    • https://cdn.sqhk.co/mugukawi/fEJbjju/zesotukek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494875/normal_5fe03058b54fe.pdfIn PDF document text
    • https://cdn.sqhk.co/pegipoveridi/ifieflB/clash_royale_chest_simulator_app.pdfIn PDF document text
    • https://xapitutas.weebly.com/uploads/1/3/0/8/130813648/kiwamoj-weniluxosel.pdfIn PDF document text
    • https://cdn.sqhk.co/kelifevaz/jQhf08o/74165567559.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wesonujojamoga.epizy.com/stranger_things_season_guide.pdfIn PDF document text
    • http://fisejotigu.epizy.com/fubadadofojarukiro.pdfIn PDF document text
    • http://larifobuxol.epizy.com/movies_counter_hollywood_dual_audio_movie.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_off0000fd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD71 5160 bytes
SHA-256: 0744ce689e18f6e734d03b7a4e11e19d07849503729e25f1912d3f802adab176
font_01_sfnt_off00010eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEC 11432 bytes
SHA-256: e9e8764febedd479aa27620f1850fb7f8b16f70912357b5e15e491115ea3648e

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