Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ea449bd781d57fb…

MALICIOUS

PDF

64.4 KB Created: 2020-12-26 22:59:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e4801228f54b3559bf5c1eec9b335843 SHA-1: 3242b68e88bb6013ee3959fd38a625b67f852456 SHA-256: 2ea449bd781d57fb304a98ab109f6f9d60cbcfa1f533c5eabeed3f19f1e36d01
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The heuristic PDF_SEO_LINK_FARM specifically indicates a mass of external PDF links, suggesting an attempt to direct users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafficel.ru/aws?utm_term=jajaja+ogene+music PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409421/normal_5f9737d6cd7cf.pdfIn PDF document text
    • https://cdn.sqhk.co/denobafopum/Um47Z4u/69430544112.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475571/normal_5fdb997167abd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392218/normal_5fa92036e1873.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/199877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378843/normal_5fdbdd5fa94e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402949/normal_5fe733a22e5a4.pdfIn PDF document text
    • https://lixubirenolona.weebly.com/uploads/1/3/4/6/134669397/a96a346a8018.pdfIn PDF document text
    • https://tufiganifipira.weebly.com/uploads/1/3/4/3/134310976/f2158.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eb7a094-0baf-4fba-93e4-c9bc756380f2/fevibuxejubiwinepavipuko.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/23385663497.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_off0000bbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD8 5056 bytes
SHA-256: 214e5b60e7e7bfac86cb01ad6b6a1a1b983a99ac887833faf1ff0bff2f849ef5
font_01_sfnt_off0000cd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD09 11932 bytes
SHA-256: 858f0878b6fd4b2e537f9c7a5d154cdec9d405c15e502c6cc0f0fabd4d587898

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