Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0d9026c9114676d…

MALICIOUS

PDF

82.5 KB Created: 2021-03-29 15:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: babffcbe8bf8d008a8652a74b10072df SHA-1: b6e13f3750d993149016c1a5f5ea6a1a6844d884 SHA-256: a0d9026c9114676ddb2fa1b486250b0855d0ffdb38c7242640f57e8d97685dd7
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to 'interlopers multiple choice questions answers'. No scripts were extracted, but the sheer volume of suspicious URLs indicates a strong phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://jottigo.ru/123?utm_term=the+interlopers+multiple+choice+questions+answers PDF link annotation
    • http://jewopeka.22web.org/11262788398.pdfIn PDF document text
    • http://dazipuv.iblogger.org/revised_bloom_s_taxonomy.pdfIn PDF document text
    • https://cdn.sqhk.co/xowuzaseku/R1K8Rvv/call_me_emperor_ministers.pdfIn PDF document text
    • https://cdn.sqhk.co/segevenujuka/7jahehg/dark_theme_wallpaper_for_oneplus_7.pdfIn PDF document text
    • http://milesnires.xyz/kawasaki_mule_2510_service_manualrqovp.pdfIn PDF document text
    • http://wezutoxizuwal.22web.org/serudu.pdfIn PDF document text
    • http://xadikefivo.iblogger.org/dalanilofolevatizevow.pdfIn PDF document text
    • http://ruzoboxilotazex.22web.org/32353774090.pdfIn PDF document text
    • http://topcreditcheck.info/41175918164w9yig.pdfIn PDF document text
    • http://complect-tech.ru/96175765681i22db.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_278c24a0b98844128736dde5e396d281.pdf?index=trueIn PDF document text
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_32a8e27203c64814b1da0bf0138d8487.pdf?index=trueIn PDF document text
    • http://fururebinupi.epizy.com/byomkesh_bakshi_stories_bengali.pdfIn PDF document text
    • http://vefabafodibejeg.epizy.com/jalikalobopajulaxafo.pdfIn PDF document text
    • http://mulitaweluf.rf.gd/canon_t7i_manual_focus.pdfIn PDF document text
    • http://ragujaje.rf.gd/what_can_i_eat_instead_of_grains.pdfIn PDF document text
    • http://fafozega.rf.gd/12817559262.pdfIn PDF document text
    • https://a804c8a8-fdf7-4fba-b19b-c23aecc29597.filesusr.com/ugd/a7074a_d816600de81c4a918ca40f9fb4796f81.pdf?index=trueIn PDF document text
    • https://62c68f1a-b463-400d-b6d7-27fef4968056.filesusr.com/ugd/1d3654_ee5f53b3aaa94584b07b43b7ebb46ba0.pdf?index=trueIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_4309d7f496a14443984a4ac97c93444a.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF625 5220 bytes
SHA-256: 6f9e112cbee56239d06ff05c359e43e6aaa046c89f65f3d1d31919895350feab
font_01_sfnt_off000107c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C3 10596 bytes
SHA-256: 66f4bbe460ff60cc2304adaed39e1cee08f4f5909580d20a1dec86cf9ccc8717
font_02_sfnt_off00012bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF8 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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