Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3f38de502d6fc3…

MALICIOUS

PDF

98.5 KB Created: 2021-03-09 08:08:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 34056a6d17b510b253b805581f8c0d3c SHA-1: e5e40a3d861b8ba5189339c699fac23799076967 SHA-256: 4d3f38de502d6fc3edaac7a1d5286917fb5500fa5e9733da82b4a78437a600a0
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed for SEO manipulation or phishing. The presence of a URL with a 'free full game mac' query parameter further indicates a lure. ClamAV and ML heuristics confirm the malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/123?utm_term=amnesia+memories++free+full+game+mac PDF link annotation
    • https://lafuxekezijunu.weebly.com/uploads/1/3/1/4/131406487/7571069.pdfIn PDF document text
    • https://cdn.sqhk.co/bovefonot/eCRhijh/the_light_between_oceans_trailer_deutsch.pdfIn PDF document text
    • https://cdn.sqhk.co/kafevinuva/bjhhfji/gejivudobozale.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/68019525441wam26.pdfIn PDF document text
    • https://cdn.sqhk.co/divekezor/ihjhswP/halloween_freeze_dance_for_kindergarten.pdfIn PDF document text
    • https://maludanojuwido.weebly.com/uploads/1/3/4/5/134591959/vozevimotisupe.pdfIn PDF document text
    • http://zuxekagapefe.mygamesonline.org/cyberpunk_2077_1.6_patch_notes_ps4.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/SjeYX26/free_horror_movies_youtube_2017.pdfIn PDF document text
    • https://bijejumutitin.weebly.com/uploads/1/3/1/4/131454352/nedokakupep-pubokajodi.pdfIn PDF document text
    • http://parralax.net/baxujamagerizidetijaxa87g4v.pdfIn PDF document text
    • https://tewafegode.weebly.com/uploads/1/3/5/3/135350941/0f326698bf0e.pdfIn PDF document text
    • https://cdn.sqhk.co/rawavuzom/gc16wPF/44158828422.pdfIn PDF document text
    • https://cdn.sqhk.co/mugapowejog/ghjWIi3/24177167627.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://626fb5af-1d67-41cb-86ce-204163677ff0.filesusr.com/ugd/9d869b_cbc7ea6e450f446b90654f774ca5a649.pdf?index=trueIn PDF document text
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_8def8bdab5084c35b1ebd4f643cd9f3a.pdf?index=trueIn PDF document text
    • https://bff5fdab-9fd0-4670-908b-a1308bb5a9cb.filesusr.com/ugd/227d0f_92cc04f5dd1c4acb8cecf7001b80164c.pdf?index=trueIn PDF document text
    • http://jowawaba.atwebpages.com/vafuzuzinok.pdfIn PDF document text
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_6be8582eacf04d218ed82fbc0c83281b.pdf?index=trueIn 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_off000143b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143B1 5192 bytes
SHA-256: 4a841337c29e2e079509b6a6a0c5cd1141b6870313ff096a6147d76a58be153c
font_01_sfnt_off00015541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15541 11932 bytes
SHA-256: 98152b3ee17f626917c94463beeaec687a8713c0dda4da669d9e3b73b0ec38f8

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