Malicious PDF — malware analysis report

Static analysis result for SHA-256 9261a141479013a9…

MALICIOUS

PDF

83.7 KB Created: 2021-04-08 19:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7a0a0d0aa94186d3e069eb62ae388d44 SHA-1: 41dcd29ccf0e14af02a46934ead22b6ca8d989d2 SHA-256: 9261a141479013a92fb67f16c41c0c3c0e5592a77bfdd05f1f2ba7665ec6925b
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting services and redirectors, indicating a link farm designed to obscure malicious destinations. The presence of a link to 'yafferge.ru' with a 'free 2d animation software' UTM term suggests a lure for potentially unwanted or malicious software. ClamAV and ML heuristics confirm the malicious nature of the PDF, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=free+2d+animation+software+for+windows+10 In PDF document text
    • https://cdn.sqhk.co/zosiwutu/fgfsjbn/human_fall_flat_switch_physical.pdfIn PDF document text
    • https://cdn.sqhk.co/pulazapusaw/tdChdhh/limomotop.pdfIn PDF document text
    • http://nizavevorupuj.mywebcommunity.org/9380016446.pdfIn PDF document text
    • http://livemavuxedu.getenjoyment.net/gst_bare_act_with_amendments.pdfIn PDF document text
    • https://cdn.sqhk.co/pagozixupezi/fygcpI7/47354222451.pdfIn PDF document text
    • https://cdn.sqhk.co/fosuzonarefi/7ic8eiI/berlin_tourist_attractions_map.pdfIn PDF document text
    • http://sabovibin.medianewsonline.com/15229073564.pdfIn PDF document text
    • https://cdn.sqhk.co/fazejitev/7M1d1Mo/zexomepexudiso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_dbee1c8f36cd41b4ac5dc38903165252.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/ffx_cloudy_mirror_guide.pdfIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_b41f7ca9cf48427b98def8899b603583.pdf?index=trueIn PDF document text
    • https://1580f21e-fc75-4350-9669-3be8b7525729.filesusr.com/ugd/eff6cf_c2805aaee4634689abc94111fe109b15.pdf?index=trueIn PDF document text
    • https://9f349447-249b-4747-956a-316fe86e371b.filesusr.com/ugd/d2b720_03bd24bae4ea484498ea03b6960807cf.pdf?index=trueIn PDF document text
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_6df6f4d155d54c94b964e660189b73a9.pdf?index=trueIn PDF document text
    • https://c8d0f166-86fd-441b-8df5-aa5e6c6c7644.filesusr.com/ugd/f4b3af_881c9e2795134136967b22149ed9d79f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/posaxugidut/amma_sentiment_songs_tamil_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/workday_excel_template.pdfIn PDF document text
    • https://c96d0889-97fb-4213-90a4-a08ae01970e6.filesusr.com/ugd/ed32f2_2c3a81ae4063412eabac5e03b43fcfdb.pdf?index=trueIn PDF document text
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_8a0198c7b4ff4fbcb424d4efb1c24a88.pdf?index=trueIn PDF document text
    • https://ac734925-007a-49fa-9a6b-2340142042ec.filesusr.com/ugd/ea78e0_bf85ca00a074467f85de69aba025162f.pdf?index=trueIn PDF document text
    • http://vekisofekibote.myartsonline.com/jisunulotapo.pdfIn PDF document text
    • https://18cceff7-6d50-42ec-9d85-67184b61345e.filesusr.com/ugd/8c2e83_d9b0e7973a9d4d1ca806d4cfb29aaf88.pdf?index=trueIn PDF document text
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_315a7b4bac6d42689de9bc528671271f.pdf?index=trueIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_9d5447b424144756988d7fbe60b2fd82.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAD 5184 bytes
SHA-256: f0156bbcfc391405d614e4c6b293b4529fbf601fe7f5ae54eb91118b4242c65f
font_01_sfnt_off00010c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C42 11152 bytes
SHA-256: fc63ba1ff5d8dd5040a05f56e5e60d7f6148e497283835c70f85c6028365cf7a
font_02_sfnt_off00013254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13254 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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