Malicious PDF — malware analysis report

Static analysis result for SHA-256 44b271f0659f9ec4…

MALICIOUS

PDF

75.3 KB Created: 2021-04-01 00:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1924c9fa4e8902d8a7cec4e8757c2f20 SHA-1: 521d86989cb429d19f33ba3546cdd3bb3af46d3d SHA-256: 44b271f0659f9ec4dd3dd590920034082f19031f81b6f11c97a80eab3e9b9543
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://golowaki.ru/strik?utm_term=is+goat+simulator+2+player+ps4 PDF link annotation
    • https://cdn.sqhk.co/xororasomig/vggibBA/buboxubasiwemoxuferewan.pdfIn PDF document text
    • http://freud.icu/43245234556utomj.pdfIn PDF document text
    • https://cdn.sqhk.co/tujuvemevo/6gchFab/1623230669.pdfIn PDF document text
    • http://karma-911.com/fobigotosivulavoku4qv9i.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzaxepigi/2heKEia/fijemax.pdfIn PDF document text
    • https://gutirevenomosub.weebly.com/uploads/1/3/5/4/135400373/8117b.pdfIn PDF document text
    • https://waratuzinasu.weebly.com/uploads/1/3/4/7/134719343/vimifuleti.pdfIn PDF document text
    • https://xezafeliwi.weebly.com/uploads/1/3/1/3/131381443/4873822.pdfIn PDF document text
    • http://busivel.xyz/pebepexuzufekonugegabo9m6il.pdfIn PDF document text
    • http://lunesygets.xyz/how_to_learn_chinese_fastcagoq.pdfIn PDF document text
    • http://musc-media.xyz/sweden_allsvenskan_league_table_form07vgv.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/iie0mYV/lv_mini_hl_speedy_size.pdfIn PDF document text
    • http://fringigejy.site/tadoxaxunupukexej42f4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ac734925-007a-49fa-9a6b-2340142042ec.filesusr.com/ugd/ea78e0_b8762bf5ad834e4e9e75cb61ad41de8c.pdf?index=trueIn PDF document text
    • https://a2214900-82f6-4ed5-a432-d5ffd14110fa.filesusr.com/ugd/306b6b_bb79a61286784127a01f1065e8ad3e8e.pdf?index=trueIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_7a020829d42b4b6596f5fb91d0216031.pdf?index=trueIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_b162f5ef31e74e719e3f1023fd57a33f.pdf?index=trueIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_99641312dd254baf98daed919945b667.pdf?index=trueIn PDF document text
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_6e0f9fc708b142e893076f08a994d060.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_off0000e673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE673 5400 bytes
SHA-256: 44f2961223ee9acce384ac1fc5658ffaaaa2c1af90697ab61e0349628a96b0c0
font_01_sfnt_off0000f8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CF 12236 bytes
SHA-256: c4787e9a38ebd7722e49f686f7e9f0befc9f6e210d8d7d0461fcf64241f6b190

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