Malicious PDF — malware analysis report

Static analysis result for SHA-256 79142855fc63ed9a…

MALICIOUS

PDF

67.9 KB Created: 2020-12-23 16:09:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: fcde3336618c9793fb270851facd9027 SHA-1: 92da3d8e1761466b5e43b085546d944f78f90b50 SHA-256: 79142855fc63ed9a22c9fb8cfa43692800739557d67868bf4a27ba506c061eb0
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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/123?utm_term=appflix+premium+apk PDF link annotation
    • https://visufevulun.weebly.com/uploads/1/3/4/3/134310134/602167.pdfIn PDF document text
    • https://xataramev.weebly.com/uploads/1/3/4/3/134320843/tapalisizemef.pdfIn PDF document text
    • https://mebevoluw.weebly.com/uploads/1/3/0/7/130739105/zenefogi-rudej-bokawunabo-zidefuwukerup.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/ruzumeb/nunusiripogeledabu.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/camscanner_pc_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc1d4870-eee2-41df-a64f-0945faafd3b5/bofologiguberubigalafajil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5a6aebc-8182-497c-b0e9-b2fe203b4109/92816539182.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/057e3ae0-e0b7-4022-8f4a-558872a8b725/peter_singer_animal_liberation.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/seismic_stratigraphy_and_depositional_facies_models.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c097d474-df14-4346-b06a-2e46fba05ba9/46223950850.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f127e52e-708d-4a1a-b20b-594d1d70721e/7552076763.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC21F 4576 bytes
SHA-256: 4d83c361956ecf3a1695165a14197a7ca642ad986274d33bebbbd86d5cda520d
font_01_sfnt_off0000d1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AA 10484 bytes
SHA-256: d841bba1ab7084227f2739db44586cb3bc555fb22efaeaddfcf000d3b5751717
font_02_sfnt_off0000f549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF549 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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