Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85aa67690b3c493…

MALICIOUS

PDF

89.0 KB Created: 2020-12-25 05:56:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: dce73ce55eca803e3e61d57ed4e2d021 SHA-1: 5139a94cbcd407ef505d184bc50b961759b29587 SHA-256: c85aa67690b3c493e155bb13c179b3f62a171a206e86e6a36c7a272c35b5fbd2
194 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 link farm with numerous external links, many hosted on disposable domains, designed to obscure the ultimate destination. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this is a phishing or malware distribution lure, likely attempting to trick users into downloading further malicious content by masquerading as a useful template.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffi.ru/aws?utm_term=project+dashboard+template+excel+2010 PDF link annotation
    • https://sibitolifi.weebly.com/uploads/1/3/4/7/134732274/diseru-zimufaxiza-gijivujalub.pdfIn PDF document text
    • https://pepukuvem.weebly.com/uploads/1/3/0/9/130969690/refulowidosedox_xujubeloji.pdfIn PDF document text
    • https://kagivosivozavex.weebly.com/uploads/1/3/4/7/134746508/povatowadugel.pdfIn PDF document text
    • https://fosapiluni.weebly.com/uploads/1/3/4/6/134653401/a55dad0598.pdfIn PDF document text
    • https://besuxape.weebly.com/uploads/1/3/4/3/134374749/1599914.pdfIn PDF document text
    • https://taxudomajifi.weebly.com/uploads/1/3/4/1/134108655/8266293.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/1d27a800-a8cc-4b4c-a1f6-8f2321e91518/satadetivoziwelitivininu.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/biwi_ke_huqooq_shohar_par_in_urdu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52eca3e8-badb-4d80-9e35-8f7a48079009/investigational_new_drug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c1ced04-825e-4c86-a963-c1b4e9c58ffd/pontiac_solstice_repair_manual.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_off00011f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F10 5924 bytes
SHA-256: 790cc76a9438a79205b35ace9c028085a854a971649a670821e032f284cf9ea1
font_01_sfnt_off00013318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13318 10536 bytes
SHA-256: 428bf86f0caf2770d7da6ea740a370b8bc77099fd89544a54dcd2f682446e80f

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