Malicious PDF — malware analysis report

Static analysis result for SHA-256 941142cfcc07a0c9…

MALICIOUS

PDF

64.8 KB Created: 2020-12-19 20:44:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c90cffb8ed7fed3dea074d979c7635dd SHA-1: d5887d1606d2e452ad56f68731246060f847e6be SHA-256: 941142cfcc07a0c95b8e6b4d7714a3314f1353b987bf2db78ba7b0cd8e9a6d35
214 Risk Score

Malware Insights

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

The PDF contains a link farm and redirects to known malicious infrastructure, indicating a phishing or scam attempt. The embedded URLs and the heuristic firings strongly suggest the document is designed to redirect users to malicious sites, likely for credential harvesting or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://gettraff.ru/123?utm_term=millas+a+kilometros+equivalencia
    • https://cdn-cms.f-static.net/uploads/4379220/normal_5f95862d54781.pdf
    • https://cdn-cms.f-static.net/uploads/4481408/normal_5faf493be142f.pdf
    • https://cdn-cms.f-static.net/uploads/4389355/normal_5fa15093ed2da.pdf
    • https://cdn-cms.f-static.net/uploads/4459182/normal_5fc36b5220195.pdf
    • https://cdn-cms.f-static.net/uploads/4459318/normal_5fd3b9a8b4f05.pdf
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/kerofamexiral-muzukolu-jawojunapi.pdf
    • https://cdn-cms.f-static.net/uploads/4378830/normal_5f916f6454871.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6cb98405-a510-4e8a-9997-2ecd9fd8cd0f/34352715328.pdf
    • https://s3.amazonaws.com/felasorarabipis/vetozanowaduvada.pdf
    • https://uploads.strikinglycdn.com/files/2d098c1d-5fae-4a3a-a425-b9a3c565bc74/12297822423.pdf
    • https://s3.amazonaws.com/ropuba/72435461305.pdf
    • https://uploads.strikinglycdn.com/files/fcc4c1a3-19db-4b19-80fe-1a3aebfa8f50/rezefadaborunim.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_off0000c138.bin
5bcfb7bcc6ae9436d43e469f47e4858898a64f7fa56bee0e06744237884fd558
pdf-font-stream PDF embedded font (sfnt) at offset 0xC138 5200 bytes
font_01_sfnt_off0000d2e9.bin
ea56ad12041bbcde122a31ab3562c192c7add007b79657b9c24e254a832cb6a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E9 10484 bytes