Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d66d0333a2b288…

MALICIOUS

PDF

66.1 KB Created: 2020-11-25 10:34:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 15b49921324301f95b10df91c6035c7a SHA-1: ef8bd88401e4fca5f4bda48dbe734ff8d44c5549 SHA-256: 52d66d0333a2b288a548dbdbab24031845758f7dbf9ca4fbe6742f0cbf6aada4
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, flagged as a 'PDF_SEO_LINK_FARM', suggesting an attempt to manipulate search engine rankings or redirect users to malicious sites. The ClamAV detection and ML classifier output strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a downloader or redirection mechanism.

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://traffset.ru/123?utm_term=gerd+diet+pdf+virginia PDF link annotation
    • https://zevofukuje.weebly.com/uploads/1/3/4/5/134585027/1c4bff82a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414864/normal_5f9fc39064683.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373999/normal_5f911d75679f6.pdfIn PDF document text
    • https://gidepojijozi.weebly.com/uploads/1/3/4/2/134235950/8645252.pdfIn PDF document text
    • https://dodivimibo.weebly.com/uploads/1/3/4/3/134305777/lafifogukowagarobo.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/8478f7b2-20f8-4964-a014-8c54cafa3b4c/52950067139.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/girlz_ink_store.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/tezewu.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/guiding_principles_of_risk_management_army.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/34412006642.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/33791003139.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_off0000c532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC532 5088 bytes
SHA-256: 41ecac7a4e1c7f11a846dab3c993b4226e068f623bb3cee0c285e93331e5bfef
font_01_sfnt_off0000d6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A4 11032 bytes
SHA-256: b1af7b54a48a5b9d355363b66ff3613e8628f1dad1c2f895f1273fd5166fedca

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