Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6da1ff83f100105…

MALICIOUS

PDF

68.9 KB Created: 2020-11-26 03:49:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: c58e0ae4855e32de3f9cc198db7d0524 SHA-1: 2f6af3d4a6c555ed9b06932356b5fd8377481789 SHA-256: c6da1ff83f100105d91a37131aca0a3fdf7a1edc8cf080644937acc0d542d25e
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://trafffe.ru/123?utm_term=tcm+forklift+service+manual+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469104/normal_5fb27ef09585d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471710/normal_5fb4f3b6ef983.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488855/normal_5faec22174f76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417327/normal_5fbd016a9e85a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446374/normal_5f9f29f2e2501.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366632/normal_5f8a055c8be82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448094/normal_5fa66cae8d986.pdfIn PDF document text
    • https://sokegipamemaxo.weebly.com/uploads/1/3/4/3/134345901/rovowazovuvabaso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tipikaxe/rasutibetepiboxol.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/60822464135.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/78471122735.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72811f4b-cbfa-4314-81aa-43ab5630004c/unlimited_power_by_tony_robbins_drive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7579fed-899e-4eb8-88d2-87305a7f23df/97993236080.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC224 5348 bytes
SHA-256: d57e99db0e9543e812ceefb45922883e9f0f17c488716eb621ccca32e71892e4
font_01_sfnt_off0000d445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD445 10720 bytes
SHA-256: 1042122b0079646db1532f6a57c345487352a711ab9c5c3418f75112f77502f2
font_02_sfnt_off0000f8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CF 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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