Malicious PDF — malware analysis report

Static analysis result for SHA-256 498d074e39389585…

MALICIOUS

PDF

72.4 KB Created: 2020-12-18 16:21:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1eeb07468179f12b39715808a38d60ef SHA-1: 2366729e0757012820ba0cd5b8e081967458a22f SHA-256: 498d074e3938958542d2452874958c80014017604f460fa9458ec11bcb9ffe68
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external URIs, with one prominent URL pointing to a suspicious domain. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the presence of external links and the ML classifier's high confidence score strongly suggest malicious intent, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=xicor+dbz+heroes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484834/normal_5fd1ef8b536cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372100/normal_5fab55e207dfa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386347/normal_5fc89ab526723.pdfIn PDF document text
    • https://nabesoke.weebly.com/uploads/1/3/4/0/134042749/duwajo-miboxalorov-pedumibik.pdfIn PDF document text
    • https://nogorixarolixi.weebly.com/uploads/1/3/0/7/130740589/lavabukevujomu.pdfIn PDF document text
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/f432ca3e94b58.pdfIn PDF document text
    • https://nujawarasut.weebly.com/uploads/1/3/4/3/134310583/5478232.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404740/normal_5f92b3055bfc2.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/fizup/lagu_alan_walker_lily_remix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18969447-833d-42a6-ac74-e8fa42ad0081/zimavoguzuwe.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/aunt_jemima_frozen_sausage_biscuits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bd5687e-a217-4177-83e6-996e68c04fe7/ge_7-day_smart_digital_timer_switch_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0c9400e-1972-4f2b-badc-bd2d468a92ca/blue_ember_grill_ique.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_off0000d223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD223 3420 bytes
SHA-256: 1ad80ca0ecfac62f95a5f005c4537917b5414b714f75ea906a215293b029f400
font_01_sfnt_off0000de4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4E 4952 bytes
SHA-256: 391b4e843098968c77e53888b70a1cdb54afdd9719cf3c2c7cca246400771494
font_02_sfnt_off0000ef22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF22 10664 bytes
SHA-256: 71451ddfba45fe8309685f3f149ae0abadd79c49069efdb9771ab7ae12bdea5d

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