Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c0c3ec535584b18…

MALICIOUS

PDF

104.0 KB Created: 2020-11-25 05:41:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0e4897ea3fb52e1214c2a73ef48063c8 SHA-1: 6e50f6664515446faf58892069f52040b0bf4131 SHA-256: 9c0c3ec535584b18423fd9319534495b2a5d3073b8e30b939a80506a291f1436
186 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 0.9996

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://trafffi.ru/strik?utm_term=phase+locked+loop+circuit+design PDF link annotation
    • https://sazojowob.weebly.com/uploads/1/3/4/3/134351878/tojukomogat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449618/normal_5faece4421c87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383470/normal_5f9a644bb2d5f.pdfIn PDF document text
    • https://fusefediwotedi.weebly.com/uploads/1/3/4/5/134589876/4650355.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377391/normal_5f9b20f024c46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470521/normal_5fb894334799f.pdfIn PDF document text
    • https://kigivalivago.weebly.com/uploads/1/3/4/3/134337689/89deb967.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366035/normal_5f870297930b4.pdfIn PDF document text
    • https://xovonanukotu.weebly.com/uploads/1/3/4/8/134898985/a5a20a9ea8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380540/normal_5fbdd24683c6a.pdfIn PDF document text
    • https://wojedebaroz.weebly.com/uploads/1/3/1/6/131637691/3271694.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/potamotaz/folizomumotejo.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/milikinatolasajadelagug.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/78504629808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/252ff5b0-f08b-4df7-be2a-999671699d4f/tobolojabulu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn 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_off00014247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14247 5400 bytes
SHA-256: 99a65c9295135acc0d9e4d32609dd8c20ca2365962e3317a8d561d6837dd158c
font_01_sfnt_off0001549c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1549C 11624 bytes
SHA-256: 06975c0eac611ea4ef93c5e9164786c4f32cc9b58f82b4a2636a923c72d1fe9c
font_02_sfnt_off00017c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C7E 16232 bytes
SHA-256: 08976ea26f9a6621a2a806eca0ce3968102a111807ac1d68debede9ef83235c0

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