Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae344a2e53fe99be…

MALICIOUS

PDF

72.8 KB Created: 2020-12-27 15:22:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e9b36d49c870384a362a74815933318e SHA-1: 51661982b5abe449082115b959ef7e7823d555ec SHA-256: ae344a2e53fe99be88ddc21336bc624e7de97dafd919b8c304659c0bc44c4748
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which are to PDF files, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains metadata related to 'Nelson Mandela book Oxford PDF' and the authoring application, which is likely a lure to disguise the malicious nature of the document. The presence of external URIs and a link farm points towards an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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=nelson+mandela+book+oxford+pdf PDF link annotation
    • https://cdn.sqhk.co/jekefebiba/SLhhjip/bubble_shooter_2_game_online.pdfIn PDF document text
    • https://cdn.sqhk.co/vutexexukus/8ttjhji/butisetemojagegawefeluwow.pdfIn PDF document text
    • https://bigimenuxorotel.weebly.com/uploads/1/3/4/6/134655509/zopesalomigutapujidu.pdfIn PDF document text
    • https://cdn.sqhk.co/sukurorezib/dIhcicj/54276119414.pdfIn PDF document text
    • https://cdn.sqhk.co/tezakagadol/figuVge/doom_2_classic_switch_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374009/normal_5faae1943cc90.pdfIn PDF document text
    • https://vorarixumo.weebly.com/uploads/1/3/4/4/134490966/7e7369f2a3.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzefegevo/ihhckhi/80425924070.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac33884e-46a4-440f-9f5d-025845b020da/5e_how_do_spell_slots_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df4a458a-d99e-4e57-8f5b-6c37a1c1c3c8/41033946435.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da967be0-1400-4402-92c2-f304caaccb7c/elementos_linguisticos_semantica_semiotica_y_dialectologia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75c5d80b-0c85-4c1c-8f00-3c246d866af1/37316165393.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55773176-7a1b-4679-8cb5-e6e218dc7297/fovemafurafe.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_off0000dffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFD 5428 bytes
SHA-256: 3fa069e18dc866833728a86c0578dc09096d0ad306fb06414b89925b745a266e
font_01_sfnt_off0000f25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25E 10604 bytes
SHA-256: 332059ae76ccd65c48c8e23c2baa7693437a0ef699e856f918ea059bb6e22c79

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