Malicious PDF — malware analysis report

Static analysis result for SHA-256 1821419b9a2f443b…

MALICIOUS

PDF

97.9 KB Created: 2021-02-11 01:33:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 61bf457b7c1686f95602d60b88e1b24f SHA-1: f28e267bd63bb7ce777b6f8a99753147cd203cb2 SHA-256: 1821419b9a2f443be6fa8120fd5b49623f716ac4e475b7a02bfb062b93f369ef
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, likely to manipulate search engine results or direct users to malicious sites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or SEO spam attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/123?utm_term=what+to+the+slave+is+the+fourth+of+july+discussion+questions PDF link annotation
    • https://tejukikefuxod.weebly.com/uploads/1/3/4/7/134703803/nokumupibovagon_guratafu_sisava.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404108/normal_5fd60beea3c7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485435/normal_601b4b3153425.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/hgije5Q/babakivuxujafe.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/gpc9jhd/vlc_android_autoplay_next.pdfIn PDF document text
    • https://sevafigetof.weebly.com/uploads/1/3/4/9/134902911/dugazojadukapu.pdfIn PDF document text
    • https://cdn.sqhk.co/dediwifime/XqOI889/zaxemupomugu.pdfIn PDF document text
    • https://cdn.sqhk.co/xudevekelefe/hhjeicZ/79476099847.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481273/normal_600899f5085ea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/vapebizesovetesoxozemanem.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/8043111589.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/triangles_interior_and_exterior_angles_worksheet.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_off0001440f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1440F 5488 bytes
SHA-256: ee121151cdb4777457da302663def2e0258cf9733c3de921f29009685d726dc2
font_01_sfnt_off000156ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156CE 10352 bytes
SHA-256: ca84bf05079e7ee4d938672d61f6777b69048261ae34ea3a35213ba3ac9c3ae3

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