Malicious PDF — malware analysis report

Static analysis result for SHA-256 c09f58b90cd0c923…

MALICIOUS

PDF

81.0 KB Created: 2021-04-14 00:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0c709b6e356c78827c8976366af76f9 SHA-1: 7919121c3f9b8f61058574d84f48d10cac4f4023 SHA-256: c09f58b90cd0c92374267ff16335584372fcc3832316c79ae67a2e87815c37cf
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and the heuristic findings of a 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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://zajinet.ru/strik?utm_term=panasonic+cordless+phones+manual+kx-tga470
    • https://rodugetimevo.weebly.com/uploads/1/3/1/4/131407281/jemunatozut.pdf
    • https://cdn.sqhk.co/dabigewom/ihhjhhd/drifters_white_christmas.pdf
    • https://ridewavovelomu.weebly.com/uploads/1/3/4/6/134697160/xadib.pdf
    • http://wofijolusiga.iblogger.org/68122966659.pdf
    • http://petajofap.22web.org/16720071429.pdf
    • https://cdn.sqhk.co/letarezetap/Goge6ib/lean_bulk_workout_plan.pdf
    • http://muvirire.22web.org/fefudixuxunezezarox.pdf
    • https://vawovuwowoxug.weebly.com/uploads/1/3/4/0/134040368/633203.pdf
    • https://vajinivokesele.weebly.com/uploads/1/3/5/3/135326698/201303df4058c71.pdf
    • http://sonoxusa.iblogger.org/convert_photo_to_painting_ipad.pdf
    • https://liwujozixo.weebly.com/uploads/1/3/4/4/134497145/pizetidaxate.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_1ced7df6c350400db2b5ac94f634d54c.pdf?index=true
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_d3ce820ccc59441186a124bf519c0909.pdf?index=true
    • https://s3.amazonaws.com/bulujono/misipenokod.pdf
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_05ed9149d9bd4f59a59f3c916d0ed68d.pdf?index=true
    • https://s3.amazonaws.com/xewamejixolefaj/19700082528.pdf
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_bb8def766c6548878f2e6d1f868ff762.pdf?index=true
    • https://502f924d-676a-41b3-8220-87c01882f600.filesusr.com/ugd/5a20bb_3b66c12ef6204bdf81c491f1f84e7c73.pdf?index=true
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_2fdd1fe0948e4d63aad59a321dec42de.pdf?index=true
    • https://926da24b-d3df-4aea-ac1b-ebdf7359a9e7.filesusr.com/ugd/fef925_7893a0fbeb854056b32576b8c8eff86f.pdf?index=true
    • https://590703a0-be71-4d3c-a49f-17767d5969ef.filesusr.com/ugd/656c20_2118cd0e79404c4291407e40068404ba.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_off0000fbf4.bin
defc31c20b3134a3d2d2ab7616a5a5f994a154acba098b851a926e5e53afae0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF4 5964 bytes
font_01_sfnt_off0001102a.bin
72d0afedc5a3971015e7fa6a1f92ac7d5e01d68d330cc34e5bf104c1f042b9c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1102A 11344 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.