Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a7bcdf998f5f01…

MALICIOUS

PDF

70.6 KB Created: 2021-01-08 13:40:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ce93b2da70dc1614529c4f5038663b2c SHA-1: 79f03882efd8eab1693132b77c5e96d1391d96c3 SHA-256: 65a7bcdf998f5f01bc78d4c5c257e9061b5bf57c3ebbe26fed376ba8ecb2efb2
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, identified as a link farm. The primary heuristic indicates it's a 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM', suggesting a non-standard use of SEO techniques. The ClamAV detection and ML classifier also flag it as malicious, likely due to the nature of the links and potential for distributing further malware or phishing content. The embedded URL 'https://trafftec.ru/123?utm_term=random+postcode+us' is a key IOC.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=random+postcode+us PDF link annotation
    • https://daniwevuwawudo.weebly.com/uploads/1/3/4/8/134849628/3410491.pdfIn PDF document text
    • https://gukamixi.weebly.com/uploads/1/3/4/0/134042495/5770388.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/keNjcgg/79150738034.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/ghegdgi/rock_of_destruction_hack_mod_apk.pdfIn PDF document text
    • https://mavegisokelu.weebly.com/uploads/1/3/4/1/134131346/f80b641.pdfIn PDF document text
    • https://gepavemu.weebly.com/uploads/1/3/4/8/134861499/datilemudode.pdfIn PDF document text
    • https://wanuwoziburake.weebly.com/uploads/1/3/4/4/134458428/dulekusamedo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425492/normal_5fe43494a37f3.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/viwoxuz/tajusugurozewonijexuvesar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a8bb961-758b-453d-a8a6-a49679c4fadf/60996134768.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/barevafesosofosesan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/519c7b06-a7b3-431d-bc6f-8de65609d139/icloud_generator_v3.2.1_zip.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/wokemijibujalotu.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_off0000d753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD753 5100 bytes
SHA-256: b7a7840daa92fda8336df7647bd5ef5a5aff497a70a931209bbb261268802572
font_01_sfnt_off0000e8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A0 11180 bytes
SHA-256: c64db346860dcdadc8eeb4a75ba444b5bc6f686f2e5f0839397a85ee8065bdcb

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