Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fbb016252866bfd…

MALICIOUS

PDF

73.3 KB Created: 2021-01-18 19:16:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d3838e7510337927869afe47763a49b9 SHA-1: 75dfeab7beb014648739e1174da23d448f4f15ca SHA-256: 8fbb016252866bfd1e7b0ae445940692b9248f5ac038962e0595d156a343a476
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, suggesting a tactic to manipulate search engine results or distribute further malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', indicating it was likely generated by a tool rather than being a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/aws?utm_term=similar+triangles+worksheet+7-+3 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4500199/normal_5fc3ccae89ebe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367667/normal_5fdf381063eb1.pdfIn PDF document text
    • https://site-1211548.mozfiles.com/files/1211548/b_r_automation_studio_4__0.pdfIn PDF document text
    • http://rusedewafizurap.66ghz.com/motu_aur_patlu_ki_jodi_telugu.pdfIn PDF document text
    • https://site-1174259.mozfiles.com/files/1174259/98679047584.pdfIn PDF document text
    • https://site-1173692.mozfiles.com/files/1173692/warelebajevajojejezev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387712/normal_5f900ea9e7842.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470207/normal_5fe14978564fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372721/normal_5f8e0e6799814.pdfIn PDF document text
    • https://site-1174138.mozfiles.com/files/1174138/contract_template_for_event_planner.pdfIn PDF document text
    • https://site-1217744.mozfiles.com/files/1217744/zobupuwopavufexuvi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449992/normal_5fa4105216ad6.pdfIn PDF document text
    • https://site-1174929.mozfiles.com/files/1174929/zenosezori.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/megujobemegor/stickman_bmx_games_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/new_assamese_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/ccna_v6_chapter_9_answers.pdfIn PDF document text
    • http://velumosak.epizy.com/58780709590.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_off0000e18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18A 5636 bytes
SHA-256: eddbfe5f70011033f2734825fc8c75cfb236dba1991a3a93b80ec2a9e06bc096
font_01_sfnt_off0000f4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A8 10416 bytes
SHA-256: afb772c0df0d986f572d32a9fb6852814c1eef6a293a86bbf73d77303663c53d

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