Malicious PDF — malware analysis report

Static analysis result for SHA-256 e64b1693805ab1ee…

MALICIOUS

PDF

67.3 KB Created: 2020-12-17 00:14:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e9df8d327d4da89eadb46d16b3fd7b31 SHA-1: ddf687d145ba7a43ba63db7c30da7d0228b16bf3 SHA-256: e64b1693805ab1ee098ea4fe24ad7d6e23238739645189b2dfe6484b607f2f07
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 detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, identified as a PDF link farm, with several pointing to unknown or potentially malicious domains. The presence of these links suggests an attempt to direct users to external resources, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=pass+through+socket+set+lowes PDF link annotation
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/6934293.pdfIn PDF document text
    • https://junovolosexev.weebly.com/uploads/1/3/4/4/134467690/e6262053d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454813/normal_5fb890555e0d6.pdfIn PDF document text
    • https://xevubevisebu.weebly.com/uploads/1/3/4/7/134754503/1525033.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393179/normal_5f923b3de03ac.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/75a4a17a-e391-43cf-9218-0599d234211a/xipewesorulixowuteta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35ff4d52-a178-4762-8a32-709f007cdedf/mizevalu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9001260d-b805-4d22-ac43-6ba28ff0bef5/viweviwokavuxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9cbcc9e-6144-4d4e-8be2-3b29ee9ca2e2/dejipo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b1cb914-d8d0-4ac7-82b8-7f99d6f0a1b6/vezafalurojuralugitol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2336d85-68eb-409c-9944-41e82c9c26ec/vebujav.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_off0000cb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4D 5216 bytes
SHA-256: 9a6b8ea04ed2d63d3beacd2825dbe4313addc62a46d2adf6e78621c287c0e56d
font_01_sfnt_off0000dd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1A 10600 bytes
SHA-256: b4a3b56f6691860a9ec515cad97aae3d0fa6418fa792d90756e15ddb1716bf17

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