Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3396dcd9b8a1d0…

MALICIOUS

PDF

69.5 KB Created: 2021-01-28 15:15:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 36a41b856bb1353696e2e652da3e1ae0 SHA-1: 7680689c4a66fa6a6a50e64a74ae8e03eac4351f SHA-256: 4a3396dcd9b8a1d086c69e85daf51afd0d49cbce6a74fe36bb4a444faeb00fb0
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/123?utm_term=break+the+ice+games+on+zoom PDF link annotation
    • https://cdn.sqhk.co/silonifer/jaJOha6/19563811946.pdfIn PDF document text
    • https://cdn.sqhk.co/mojesoje/dddjfad/gladiator_heroes_clash_fighting_and_strategy_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tikugosedik/yhbigxN/flying_hero_rescue_survival_2019_superhero_actions.pdfIn PDF document text
    • https://cdn.sqhk.co/ketalidukepi/auigjfp/81843386346.pdfIn PDF document text
    • https://forugizatufuru.weebly.com/uploads/1/3/1/4/131410167/6a485318b4deac4.pdfIn PDF document text
    • http://milafikolume.iblogger.org/sorumilerisowipas.pdfIn PDF document text
    • https://wufikaxom.weebly.com/uploads/1/3/4/8/134883002/ferunisiwonelakaxul.pdfIn PDF document text
    • http://krokoboko3.xyz/principles_of_management_class_activities0un8m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497369/normal_5ff92ddfebee3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495976/normal_5fdbb74641b82.pdfIn PDF document text
    • http://pedron.fun/48779609641aqqaf.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/kisimujuk/hernia_femoral.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_off0000d43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43F 5344 bytes
SHA-256: 342d450082fc3db9dcb0200ac873dc5bd28c69d65f0f40eec3eda8bc404f4a72
font_01_sfnt_off0000e64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64D 10256 bytes
SHA-256: 7ff933eed7f0f8e720be3253347404b4deff91b8d1a65ba9c6c7356127987e42

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