Malicious PDF — malware analysis report

Static analysis result for SHA-256 61aa37dc5a07857b…

MALICIOUS

PDF

67.6 KB Created: 2020-11-17 11:43:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b2173933bdd9bf31bf259011531d763 SHA-1: 1df0693af6b230a9e814cc8e56cd1a05e77ce298 SHA-256: 61aa37dc5a07857bd9fabeaddad26120f0973fcdc6ea951485e8069568741ce2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. It contains a significant number of external links, with one pointing to 'https://trafftec.ru/123?utm_term=mutants+genetic+gladiators+mod+apk+revdl', suggesting a phishing or SEO spam campaign. The presence of numerous PDF links also indicates a link farm strategy.

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://trafftec.ru/123?utm_term=mutants+genetic+gladiators+mod+apk+revdl
    • https://baletepo.weebly.com/uploads/1/3/0/7/130776023/5c7eb1413c.pdf
    • https://purusoze.weebly.com/uploads/1/3/4/4/134495244/nijumaz-vamuv-duvibazodo-wogegixux.pdf
    • https://kodivowu.weebly.com/uploads/1/3/4/3/134360374/f1ea56366.pdf
    • https://zexivuwesime.weebly.com/uploads/1/3/4/3/134356920/dozaj.pdf
    • https://bibonuben.weebly.com/uploads/1/3/4/5/134576194/terezetaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/laradusa/22019949731.pdf
    • https://uploads.strikinglycdn.com/files/162a8f13-1704-475b-ac67-3b3c8c9de624/carlill_v_carbolic_smoke_ball_judgme.pdf
    • https://s3.amazonaws.com/sazomo/que_tiempo_hace_worksheet_answers.pdf
    • https://s3.amazonaws.com/mejigavukolu/jukipivovaluwikusolomu.pdf
    • https://s3.amazonaws.com/wizuluworafid/geometry_regents_january_2016_answers.pdf
    • https://uploads.strikinglycdn.com/files/403fbeba-f128-4d28-92a8-119c3bc32656/pitomumuxebezagovo.pdf
    • https://uploads.strikinglycdn.com/files/1b1c27e9-3442-4364-b288-e106a2a8ed16/vendor_due_diligence_report_example.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_off0000cc38.bin
dd747ce26a5defcc1cd7975814b0acba565c552e6d85d9fc05199c7a11b08e4e
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC38 5520 bytes
font_01_sfnt_off0000def8.bin
1c8145dd89558b408b9d69bf00358ea2d227830d8c4d39e87bcb3a0aabadd4e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF8 10056 bytes