Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c6f8b0a5460036f…

MALICIOUS

PDF

64.1 KB Created: 2020-11-20 05:11:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7dcec668ad5ac7fd712f057bb3b950d2 SHA-1: 7dece448937fcfd3e51963d0f7f8ff4521dbf540 SHA-256: 0c6f8b0a5460036fc739cbc67bda3557f035655e360bcf092560e59fed7d9520
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://traffset.ru/123?utm_term=scientific+management+approach+pdf', is likely part of a phishing or malicious redirection scheme. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users to potentially harmful 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-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://traffset.ru/123?utm_term=scientific+management+approach+pdf
    • https://kiriwalukejogof.weebly.com/uploads/1/3/4/3/134310578/41139cf48971c99.pdf
    • https://zewobukepefew.weebly.com/uploads/1/3/4/4/134485556/fulog.pdf
    • https://xikosenazegan.weebly.com/uploads/1/3/0/7/130739601/lulowoguvodive-numozimekop-litoku-zipijedatopib.pdf
    • https://bigimenuxorotel.weebly.com/uploads/1/3/4/6/134655509/b416c.pdf
    • https://vajigapevinukaz.weebly.com/uploads/1/3/4/5/134578345/venitigu_mopuse.pdf
    • https://numuluga.weebly.com/uploads/1/3/4/3/134307024/dutukofopa-giroboler-niletojizivomoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8c4918d3-ef2b-431c-91ed-27bbe587c557/35136062491.pdf
    • https://uploads.strikinglycdn.com/files/bdd9dc9a-c16e-4796-90f2-cee55c0e42e5/15411795404.pdf
    • https://uploads.strikinglycdn.com/files/4187c81b-09a8-4568-85b8-0c7e9bf3aa99/43854112136.pdf
    • https://uploads.strikinglycdn.com/files/c38ee750-8719-4a77-9d77-80394825ea1e/wujonit.pdf
    • https://uploads.strikinglycdn.com/files/c2669328-c505-4781-85b0-64576d4dbafd/3230730459.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_off0000c20e.bin
822d6d654f6602bbe02ee0f184234fa637672dc412521f116a7d319923167925
pdf-font-stream PDF embedded font (sfnt) at offset 0xC20E 5460 bytes
font_01_sfnt_off0000d476.bin
b2fc21a6886e3a44e497b081a2de5312eb6cfb3bc38c1ba3f24fbc2f63238986
pdf-font-stream PDF embedded font (sfnt) at offset 0xD476 9348 bytes