Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6747c9dab4f5445…

MALICIOUS

PDF

66.3 KB Created: 2020-12-23 08:24:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 54738fb824ab734d4e2dcf41ad6e02d8 SHA-1: 1ecefa7257986e94efc2254ab9e908d68ef67e84 SHA-256: a6747c9dab4f54457d1495ae121fcba3bc708e0852cd3b5ba2c0127fb7c172df
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://traffking.ru/123?utm_term=bohemian+rhapsody+piano+solo+sheet+free PDF link annotation
    • https://pulezigo.weebly.com/uploads/1/3/4/6/134600697/4389788.pdfIn PDF document text
    • https://pekumovulimezel.weebly.com/uploads/1/3/4/3/134363026/lisixunofel_ginafe_ragagenezeporel_getave.pdfIn PDF document text
    • https://rujasuxok.weebly.com/uploads/1/3/1/6/131606047/6b33e7e7d.pdfIn PDF document text
    • https://nefufepaxesa.weebly.com/uploads/1/3/1/4/131453268/vobavuwame.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426087/normal_5f99fb23d1d13.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423780/normal_5fcee01d396eb.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/d08f43a7-a481-40bf-80d1-29a7b266c9f3/terre_haute_humane_society_foster.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ea21e2fce462bc8c0024/t/5fc2921a3485235c861a8655/1606586906513/nopovowumapatezusuweno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a24c1b65-0a0f-4e4a-9e9a-4afcfd8d50ab/7328434785.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5d9e660f2895dc109c93a/t/5fd5f106313c42342b817965/1607856395772/khmer_alphabet_practice_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/boxefigolixesenuvir.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_off0000c835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC835 5432 bytes
SHA-256: dbd6f6cc5285caf607b95605e60d270559da99d74c0f88b491defc33e1525cad
font_01_sfnt_off0000da88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA88 10092 bytes
SHA-256: 836dfad8b21fb60f2bc88c4f79f6a341f4c989ce9fa34e1475ff1922b2c5582a

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