Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b6e21499437b3d5…

MALICIOUS

PDF

79.1 KB Created: 2021-04-01 19:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7575a508955230b4c5b55323282c476 SHA-1: 50a3124e37b998d4fdb83a8b7d62e19eb7cb6d29 SHA-256: 1b6e21499437b3d53482fe0972f65f586ed8f42ca5133ec645dcd52ed5d8b1fe
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' designed to host many PDFs. The presence of a URL pointing to 'baarspo.ru/strik' with a query parameter related to medical treatment suggests a phishing or scam attempt. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/strik?utm_term=blood+clot+in+the+eye+treatment
    • https://cdn.sqhk.co/pikukafil/ecYgfTo/62032268816.pdf
    • https://cdn.sqhk.co/wafepazi/jghjTgN/96454160262.pdf
    • https://cdn-cms.f-static.net/uploads/4488336/normal_605d748a466df.pdf
    • https://cdn.sqhk.co/zowonefaso/asgijJz/cargo_plane_city_airport_level_3.pdf
    • https://cdn-cms.f-static.net/uploads/4471253/normal_602f6c2ca8956.pdf
    • https://cdn-cms.f-static.net/uploads/4445104/normal_60286bc590694.pdf
    • https://cdn-cms.f-static.net/uploads/4366980/normal_604dd7e88a1e1.pdf
    • https://cdn.sqhk.co/lofesaxudiwo/eIt4Did/animal_restaurant_game_how_to_earn_plates.pdf
    • https://cdn-cms.f-static.net/uploads/4374857/normal_600bc722429f4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d1b33a7b-cde1-45d4-bc15-d4d3b6236ac5.filesusr.com/ugd/1d64af_be01121996a2498390037a22b17c9c19.pdf?index=true
    • https://s3.amazonaws.com/wazotojemov/baofeng_uv-5r_review_2020.pdf
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_7ad159e663c24ec79cf964f89c7d65b0.pdf?index=true
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_3dd2dde40eaa420bb88df26fa04d2613.pdf?index=true
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_ebabae8d79f14830a9949fcca09e8598.pdf?index=true
    • https://s3.amazonaws.com/muvevanepen/rusufove.pdf
    • https://s3.amazonaws.com/jodabiladezot/equipped_for_every_good_work_s.pdf
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_47120f9118a6445192f3f6ea35417cc7.pdf?index=true
    • https://s3.amazonaws.com/fatisake/17851025799.pdf
    • https://fed4949e-3809-4fc0-a28b-84c5d390f589.filesusr.com/ugd/94482e_9eb6787359a84d3f8ab047e68aa3618c.pdf?index=true
    • https://fb9345b8-40be-4608-a8ff-9c5427dba92f.filesusr.com/ugd/98d639_5fedf1bb50624f07a3bb620d2ed56713.pdf?index=true
    • 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_off0000f8aa.bin
1bbd9b5d2ffb6c5bfaf88f5fb1333a51ac02b34ec9efb2a27a1a8055ad9ca4fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AA 5152 bytes
font_01_sfnt_off00010a10.bin
1328860eb97bd10c0a1012dea431da63772141131d81a50a7cd68bb808f6f9d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A10 10748 bytes

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