Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a585f38faa6f7e…

MALICIOUS

PDF

77.2 KB Created: 2021-04-10 12:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 640ab654c6c8bb65eaaa3d27c94eeef8 SHA-1: 7e19d64f749e15d896ae6957c592d551d5beedfa SHA-256: 33a585f38faa6f7e45a174a0727b8be24222a9b5b309f86da1f2fc2741f7a275
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The embedded URLs likely lead to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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=p+type+and+n+type+semiconductor PDF link annotation
    • https://cdn.sqhk.co/bugininaxi/hijlxig/brimming_with_love_soundtrack.pdfIn PDF document text
    • https://xidiziwuzubiwon.weebly.com/uploads/1/3/4/6/134653180/6949034.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/ifughii/guwuwanotuvofebema.pdfIn PDF document text
    • https://pebabole.weebly.com/uploads/1/3/4/6/134698512/mupewosarafodokidib.pdfIn PDF document text
    • https://cdn.sqhk.co/rugofufol/hcidihe/college_craftsbury_vt.pdfIn PDF document text
    • https://puguguduzi.weebly.com/uploads/1/3/0/7/130739618/wuzeriju-mulaledi.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/Iifuhgp/adderall_withdrawal_symptoms.pdfIn PDF document text
    • https://cdn.sqhk.co/lojeliju/5hbkhdF/infectious_colitis_diet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_84d496530d334f66b683eb14be15b873.pdf?index=trueIn PDF document text
    • http://setimuduwimu.epizy.com/xalekufosimoturutapexon.pdfIn PDF document text
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_6004c1f1396c4576a4a9db8d54721395.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb8ad6c1-a29d-4055-a3ae-f4395c6527b0/what_was_mapp_v_ohio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a214c146-accb-4233-865a-441dd57343ef/gigilunujemaleratot.pdfIn PDF document text
    • http://kapivuvarebe.rf.gd/newesewumuleketakazor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe97af56-b574-410e-9d47-12eb4564ce04/3_examples_of_project_management_tools.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e252bc5d-17c8-4068-a84c-8789859819ae/48815220118.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9A 5292 bytes
SHA-256: 31d82e1240ad80f88d4368e78223febc61bd7aa69fdeb0285db27aa884f889bd
font_01_sfnt_off00010189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10189 11260 bytes
SHA-256: d4af618e629004f2f7af2045ba2efcba1d6541e1bdad094665d48580a5d4aac4

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