Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5a27a36cf871b6…

MALICIOUS

PDF

75.6 KB Created: 2021-03-29 21:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac8dbf08bf19a74ad2cdb37020d6d097 SHA-1: dba8120bdbc87d08204fd6950e73c336412649bf SHA-256: 3d5a27a36cf871b6d2bb7f7fcabc34b02f73edf231876fe9f851da36a51c49bc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files, indicative of a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/aws?utm_term=statistics+for+dummies+ii+pdf+2nd+edition
    • https://cdn-cms.f-static.net/uploads/4366969/normal_6042e6ae16410.pdf
    • https://cdn-cms.f-static.net/uploads/4383704/normal_6024bca701044.pdf
    • https://cdn-cms.f-static.net/uploads/4413000/normal_602338a5edcf0.pdf
    • https://static.s123-cdn-static.com/uploads/4369486/normal_5fcc182a81a26.pdf
    • https://lawejuja.weebly.com/uploads/1/3/0/7/130740077/5297633.pdf
    • https://cdn-cms.f-static.net/uploads/4383791/normal_602d9ba691498.pdf
    • https://sovuzozasofebod.weebly.com/uploads/1/3/4/3/134343281/xarawigifarewite.pdf
    • https://cdn-cms.f-static.net/uploads/4387241/normal_6042fd53f0f60.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/biwubeleba/android_tv_box_uk_best.pdf
    • https://s3.amazonaws.com/rezugekolaba/bgrs_guide_contact.pdf
    • https://s3.amazonaws.com/solonebosop/ditukekanasewitipol.pdf
    • https://s3.amazonaws.com/divikufifir/how_do_you_light_the_pilot_on_a_jotul_gas_stove.pdf
    • https://s3.amazonaws.com/gavobawum/48383448531.pdf
    • https://s3.amazonaws.com/nemafu/gastonia_police_department_accident_reports.pdf
    • https://s3.amazonaws.com/falufusu/soccer_player_workouts_at_home.pdf
    • https://s3.amazonaws.com/taturi/44619283288.pdf
    • https://s3.amazonaws.com/mutirexa/chicken_coop_plans.pdf
    • https://s3.amazonaws.com/kakekojezutok/best_online_drug_guide_for_nurses.pdf
    • https://s3.amazonaws.com/liguwubore/poe_crafting_guide_for_beginners.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e830.bin
6d4d52c50cf291875c8120af44cbc01a571e8c6ff60b07cf968fb789923c0522		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE830 5504 bytes
font_01_sfnt_off0000fad0.bin
8b3fb2f711ce7b677993a7b44fb5718af7d6da1478eb8d2d12f4d51312ebe1a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD0 11096 bytes

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