Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b78797cd57a13a…

MALICIOUS

PDF

81.6 KB Created: 2021-03-11 00:20:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0d2f7625918a5afb98191d663e4e8ad SHA-1: e326a6a1b2afc5049809b9d40b6c358167c12646 SHA-256: b2b78797cd57a13a6087f95cd4f59524737bf984cbf4573107b25a57a08a1aa0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used in link farm or phishing attacks. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan delivery mechanism. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/123?utm_term=attestation+services+are+performed+by
    • https://radogatibemif.weebly.com/uploads/1/3/2/8/132815767/a51d0d6.pdf
    • http://manamuposa.getenjoyment.net/what_is_the_latest_ipod_nano_generation.pdf
    • http://ganitigusawev.mygamesonline.org/84186579939.pdf
    • http://rexevivejegox.scienceontheweb.net/61435917930.pdf
    • http://allerop.xyz/15205744170u2cmz.pdf
    • http://help-igcopyright.xyz/759369100465kquj.pdf
    • http://localdesign.me/how_to_read_the_three_financial_statements39mc6.pdf
    • http://tujemet.scienceontheweb.net/blood_relation_reasoning_questions_download.pdf
    • https://vogaxuruxav.weebly.com/uploads/1/3/4/3/134352923/225153.pdf
    • http://rakadan.sportsontheweb.net/nordictrack_commercial_1750_assembly_cost.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/vajefam/labotap.pdf
    • https://s3.amazonaws.com/pukaridimupo/afk_arena_mod_apk_1._13._05.pdf
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_ada4ed48b5654f41a42b6b5e5fb76230.pdf?index=true
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_24b8b8b2842447b192046132e5a88d08.pdf?index=true
    • https://s3.amazonaws.com/kakef/auditor_general_report_legal_aid_ontario.pdf
    • https://s3.amazonaws.com/nuselufuzo/wajufilufabakuputasifum.pdf
    • https://s3.amazonaws.com/nilafafakem/what_is_tough_on_crime_approach.pdf
    • https://s3.amazonaws.com/simujix/las_vegas_aviators_schedule.pdf
    • https://s3.amazonaws.com/fidefofudi/carbon_fiber_sheets_blockheads.pdf
    • https://s3.amazonaws.com/gatazeromij/79905890788.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3fa.bin
54eb127f6b69f455c873819cef4b7b93e42e7133a16d4effe8837d88cd4f0daf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FA 5348 bytes
font_01_sfnt_off00010612.bin
c80d99cfb3d95a2262a47143ea838b9e4751f816345c91e7a811b1db234fb253		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10612 10748 bytes
font_02_sfnt_off00012a9d.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9D 4324 bytes

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