Malicious PDF — malware analysis report

Static analysis result for SHA-256 acfa76b939b9ad8b…

MALICIOUS

PDF

76.0 KB Created: 2020-12-14 06:32:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: e4c160530920748d9cac665e3ef24853 SHA-1: 61a0fe23adafe1db6633b7147059ca2dbc8c55e2 SHA-256: acfa76b939b9ad8bcd274499b69fdbdfafa2d0cb0b28d98b00bf17a7c9ed71b8
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ClamAV signature and an ML classifier. It functions as a link farm, containing numerous external URLs, with one notable URL being 'https://traffnew.ru/123?utm_term=high+five+ghost+and+celia'. The presence of a link farm suggests an attempt to direct users to potentially malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/123?utm_term=high+five+ghost+and+celia PDF link annotation
    • https://xavujome.weebly.com/uploads/1/3/0/7/130739328/lifis.pdfIn PDF document text
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/sesakaf.pdfIn PDF document text
    • https://wujawosekeg.weebly.com/uploads/1/3/4/7/134712458/vadewi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405946/normal_5f93bd6f95630.pdfIn PDF document text
    • https://xoverepidagagit.weebly.com/uploads/1/3/4/4/134469055/a383e03f9fbefa.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/kovalozipomux_pisefe.pdfIn PDF document text
    • https://zubawolovef.weebly.com/uploads/1/3/4/4/134481331/2008083.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://uploads.strikinglycdn.com/files/d109508c-00e2-4ccc-aa3f-0c902a4dc58e/freedom_apk_no_root_download_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5f0fcd7-f57b-4059-ad76-f41cd8ca27bf/71181126644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41f8e6b7-337b-469a-b46e-c44c241ff658/93547981487.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5021891b-ca2a-46a4-a197-f634d7b5569f/playa_vista_branch_library_los_angeles_ca.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/pronunciation_guide_applesauce.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b520e2a-42b1-48b0-9894-e6da05b0f28b/16322908358.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_off0000e077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE077 4996 bytes
SHA-256: 12682d3474f0a25853a143ed7d1fcd45d232f63d99e92754b2a7b0b4315f7a2f
font_01_sfnt_off0000f174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF174 10924 bytes
SHA-256: 4782df8d60e97914154395a04bfd186b95b7c6a1fa49e0e0447cd3742e56862f
font_02_sfnt_off00011505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11505 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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