Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ebe8d0b37a4554…

MALICIOUS

PDF

66.7 KB Created: 2020-11-17 06:14:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 56ad4fa2ff7769fe3f903349e216a39d SHA-1: 0112078e985cf951ee2f33ecf43105243b9e36ff SHA-256: 97ebe8d0b37a4554fa98d3972de17dd0591ad93e500041b05a9683be64cf1599
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary suspicious URL being 'https://trafficel.ru/123?utm_term=pt+practice+skills+exam'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or scam campaign. No scripts were extracted from this sample, but the presence of numerous links and the ML classifier output point to malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://trafficel.ru/123?utm_term=pt+practice+skills+exam PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420597/normal_5f9dd7966b45d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370269/normal_5f908385d69f2.pdfIn PDF document text
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/lanezo_xusuxuguwikati_raroviz.pdfIn PDF document text
    • https://faxosuxen.weebly.com/uploads/1/3/4/3/134342902/riboxigarufokivis.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/sowemibojev_nemavi_reguxumegen_towefek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449419/normal_5fa3e4a5a1ea7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381347/normal_5f97c3a0e5cdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370541/normal_5f9fb19bd311a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393018/normal_5f94a0bca6d38.pdfIn PDF document text
    • https://zozasegabaf.weebly.com/uploads/1/3/4/3/134354173/546db.pdfIn PDF document text
    • https://pilopumif.weebly.com/uploads/1/3/4/7/134733378/zatebof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421217/normal_5f977dc57ca0a.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/baxadelefofibuz/core_strengthening_exercises_for_seniors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c311c50a-781a-4caf-a638-3d269b56b461/newim.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_off0000c910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC910 5212 bytes
SHA-256: fe1460cee4e6b7cef9fa3547d0a54d81e21e22a886812da24d016e12569ee8e5
font_01_sfnt_off0000dab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB7 10396 bytes
SHA-256: 6b312158cf29bf1ed593def0a059bd5612ab111bb799c6f58a63dedb23ab5a30

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