Malicious PDF — malware analysis report

Static analysis result for SHA-256 64304f498dc42fe4…

MALICIOUS

PDF

73.3 KB Created: 2021-01-06 05:22:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ec57b9d2227f0ead20556d80469f315d SHA-1: e04b32e0c3b579bbf20a762bf145b158efd50703 SHA-256: 64304f498dc42fe40d3c4a4f3b9076b84410c19be773804756acfdfb3001ed1a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with critical heuristics indicating it's part of a PDF link farm and contains external URIs. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a URL that suggests a phishing or SEO spam lure. The presence of numerous external links, including one to 'traffking.ru', indicates an attempt to redirect users to potentially harmful content.

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://traffking.ru/aws?utm_term=the+celluloid+closet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406169/normal_5fe60af0c569d.pdfIn PDF document text
    • https://cdn.sqhk.co/buxotulato/jJ1hajg/18735266001.pdfIn PDF document text
    • https://wemezixogasowed.weebly.com/uploads/1/3/1/6/131637562/708232.pdfIn PDF document text
    • https://sokonova.weebly.com/uploads/1/3/4/3/134322069/gukezifat_jowop.pdfIn PDF document text
    • https://xeludelibiw.weebly.com/uploads/1/3/4/3/134371965/716a69e46a.pdfIn PDF document text
    • https://cdn.sqhk.co/jasowipe/ifggfBj/darkness_and_flame_walkthrough_part_4.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/95eeb73b-8ffd-446f-ba71-ff5fd55253e4/local_small_engine_parts_store.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00f15824-2e56-410e-ba49-db629a38c2a9/beginning_algebra_9th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/after_effects_cc_2018_keyboard_shortcuts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/667d3f17-0a87-4580-8382-85c1b35ef6a4/sutax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aabfde02-8078-4f87-9e9e-04107e64027a/8887007421.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccc444c6-28f0-4533-8295-d0905a1c327c/21448434646.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/830f792e-c81b-4894-9734-27c602619a63/86312800478.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_off0000e2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CF 4884 bytes
SHA-256: b3a4b9279c204b65a08437be01b856e197aa0a90de220df0f9e3c9fbc9996bb1
font_01_sfnt_off0000f36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36E 11104 bytes
SHA-256: 34eaf6e5bd7819119b9dcdb6e3d7725aed6fcd140b25404408de3404ac4285e1

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