Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a829dc7903af814…

MALICIOUS

PDF

99.5 KB Created: 2021-03-15 15:21:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4be7da5e0d0a0febb9e9dc1f75faf0b5 SHA-1: 9e0b6aaecef4718a92ab9735e995d32d87b40127 SHA-256: 6a829dc7903af8143e0df0dd1980e76a2e82b2358525ea35a501b72dc24658c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://dugedepap.ru/award?keyword=model+building+by+laws+zimbabwe+pdf PDF link annotation
    • http://mexicotop3.xyz/72282009642silr9.pdfIn PDF document text
    • http://theharaka.online/gamuwawudigaruzuyf7mg.pdfIn PDF document text
    • https://cdn.sqhk.co/lewoxiguj/bgzgjii/11489419304.pdfIn PDF document text
    • https://cdn.sqhk.co/xutazazo/hahhhg4/yeezy_boost_350_v2_zyon_review.pdfIn PDF document text
    • https://cdn.sqhk.co/nupasoxure/jgfojgF/tuwiguzezapabevoranefev.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxamomajil/5AjjifQ/16925013984.pdfIn PDF document text
    • http://trenketo.buzz/1923871150207nzl.pdfIn PDF document text
    • https://cdn.sqhk.co/walumupo/ijBhcoB/40800394095.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/jiJ1hfR/tasedepuzuvuduzinil.pdfIn PDF document text
    • https://cdn.sqhk.co/tofatuxurejo/ijtKphj/blue_balloon_parties_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/zebimapajod/hdsghT2/59860083314.pdfIn PDF document text
    • https://cdn.sqhk.co/kupawusel/hihhcjj/jetpack_hero_miami_crime_game_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://naranosufok.atwebpages.com/6782789025.pdfIn PDF document text
    • http://pabewuvuxaf.onlinewebshop.net/engineering_mathematics_stroud_5th_edition.pdfIn PDF document text
    • http://tokumizexafu.epizy.com/jajuvo.pdfIn PDF document text
    • http://ruvatarojamun.rf.gd/chappie_dry_dog_food_feeding_guide.pdfIn PDF document text
    • http://degivenumi.epizy.com/bible_dramatized_audio_free.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_off0001473a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1473A 5656 bytes
SHA-256: ec4ab4d772b87e8d06dcde9f5c16010b91df5daf7fc1ffafac37f065deac05e7
font_01_sfnt_off00015a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A9D 10856 bytes
SHA-256: ec2a73e89447ff248e4f99519c59c67123f3f6c15422e8907f2ff622392aa899

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