Malicious PDF — malware analysis report

Static analysis result for SHA-256 46cc16542d731d9e…

MALICIOUS

PDF

71.1 KB Created: 2020-11-23 12:02:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 438e67fd2d7a6781aec2e34ee936c5c5 SHA-1: 5de29eb01edb50e9d6d2bb4ba8a500f93304fda3 SHA-256: 46cc16542d731d9ea34daabb437fafb52f58a2dce3cb9f217c626a4edd192bd4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external links to other PDF files hosted on various domains, some of which are disposable. The presence of a 'utm_term' parameter in one of the URLs suggests an attempt at SEO manipulation or tracking. The overall structure points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafftec.ru/123?utm_term=3x3+roux+method+pdf PDF link annotation
    • https://gasatuba.weebly.com/uploads/1/3/4/5/134596028/b650e52.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/6341600.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499285/normal_5fba1e9055e45.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/24d786a39f9.pdfIn PDF document text
    • https://fitepavi.weebly.com/uploads/1/3/4/4/134485464/169e2cf825e1bb4.pdfIn PDF document text
    • https://buveziketi.weebly.com/uploads/1/3/1/3/131398526/f9282.pdfIn PDF document text
    • https://laguvibokabab.weebly.com/uploads/1/3/4/3/134383318/157be710.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373769/normal_5fae9d30b5bed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368266/normal_5fa909195b47d.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/f08a2836-2762-4823-bd20-bd90bdbacbe9/vokuwabulatotemasa.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_off0000db2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2A 4996 bytes
SHA-256: 0ab20173521567fe7c7b24d42465e2bc9713dab2086b81e8df454bb54c3cd02f
font_01_sfnt_off0000ec06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC06 10456 bytes
SHA-256: 73128db1abd3ce97cdc069276cf54943b352529c10e3433d34faf0f58efc4a89

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