Malicious PDF — malware analysis report

Static analysis result for SHA-256 813617dbb2432299…

MALICIOUS

PDF

74.4 KB Created: 2021-02-15 10:40:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cd71574fc4fd693557ae8994cc676eda SHA-1: 19fafdb2048223cc5ecf9a5cfabcfb5fdf63436b SHA-256: 813617dbb2432299f7e422c40bbe645678e30289d9cbbf5970d1bf9689c7bdea
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains or link farms, suggesting a phishing or redirection scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

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
  • 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/123?utm_term=d%2526d+3.5+cleric+stats PDF link annotation
    • https://ruminugovukaka.weebly.com/uploads/1/3/0/7/130740017/c93486f16020d4d.pdfIn PDF document text
    • https://nonadokemiraf.weebly.com/uploads/1/3/0/9/130969568/fobugavunaniru-fuxomul-sajewubexom-ranupibonidanu.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/Wiijbhf/bucket_list_friends_ideas.pdfIn PDF document text
    • https://tiwokixaxuvap.weebly.com/uploads/1/3/4/2/134235176/tonudapugegalawamu.pdfIn PDF document text
    • https://cdn.sqhk.co/savaketiju/qmieigX/55234616890.pdfIn PDF document text
    • https://nozugaxuxanukuj.weebly.com/uploads/1/3/0/8/130813784/9451458.pdfIn PDF document text
    • https://cdn.sqhk.co/rinilafexowi/gig5ii9/sport_stickers_for_whatsapp_wastickerapps_romantic_love.pdfIn PDF document text
    • https://xuvunigito.weebly.com/uploads/1/3/1/1/131164310/6708664.pdfIn PDF document text
    • https://cdn.sqhk.co/xafemepino/gghg7ic/gepoxajuxelubif.pdfIn PDF document text
    • https://bexenexitefixu.weebly.com/uploads/1/3/4/7/134725849/majijaf.pdfIn PDF document text
    • https://cdn.sqhk.co/lomotutuwe/dWgfRhd/europe_map_freepik.pdfIn PDF document text
    • https://cdn.sqhk.co/suwixowefa/gifif2R/sudoku_puzzles_evil_level_3.pdfIn PDF document text
    • https://cdn.sqhk.co/kofuvufexo/dhdp1nT/55554273140.pdfIn PDF document text
    • https://cdn.sqhk.co/tupipitijil/Yrbhejf/transformers_forged_to_fight_mod_apk_happymod.pdfIn PDF document text
    • https://cdn.sqhk.co/vupapevixu/m7ii4ji/neon_field_hockey_stick_size.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/gogoxowiniza/tejanuliwozupekazan.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/nafewepixize.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/lizivitu.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/palutena_smash_guide.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_off0000eb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4F 4156 bytes
SHA-256: bb1702a9e9b617346157f9ea6f36cc14559c37d4a4a2cf683ebd57dce9d2c082
font_01_sfnt_off0000f97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97E 10348 bytes
SHA-256: e5e76faf41aea106739dfa1a9a0a7a8330412954da4979a0a943c06c70dfdfb1

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