Malicious PDF — malware analysis report

Static analysis result for SHA-256 a948563095304d43…

MALICIOUS

PDF

83.0 KB Created: 2021-04-04 15:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 25afa4f2cdf595a8c12fb6c1055577e0 SHA-1: ac5fd786d7b8ee64d4b8f41c75fb3f8ff2b9e580 SHA-256: a948563095304d4391583b54378490ba7e0f1f21edffd187c133a34e20c98327
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 pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and numerous external URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/wix?keyword=finite+geometric+series+worksheet PDF link annotation
    • http://hargotel.xyz/531360595177hzzx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491439/normal_604a44d21ac33.pdfIn PDF document text
    • http://begdas.fun/vobodofoooyh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476001/normal_6012989b329d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495994/normal_60545a3f01e54.pdfIn PDF document text
    • http://microdigitalmeter.xyz/how_often_should_a_kinetico_water_softener_regeneratey0hs2.pdfIn PDF document text
    • http://obsluzhivanie-kompyuterov.moscow/maytag_2000_series_washer_partsdpv4u.pdfIn PDF document text
    • http://idealica-official-it.website/what_are_skipping_ropes_good_foringaa.pdfIn PDF document text
    • http://zhigina.ru/lesson_4._2_practice_a_geometry_answc0a2r.pdfIn PDF document text
    • http://onlyforyou.space/medical_surgical_nursing_interview_questions_and_answershbu7w.pdfIn PDF document text
    • https://nozipukox.weebly.com/uploads/1/3/6/0/136057246/93496db96d1.pdfIn PDF document text
    • https://furivupes.weebly.com/uploads/1/3/5/2/135295821/404f35f251cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489415/normal_5fef9e71cefbf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_5384c56c9dbd4728b2fac24d20caebf9.pdf?index=trueIn PDF document text
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_ad0630ba9c06487e91317c26ab58af4d.pdf?index=trueIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_3ae9d5e2365d41c393d07cfcd4fc0a9a.pdf?index=trueIn PDF document text
    • https://19a4122d-28db-4ec2-a9e3-8c1e87f24dd5.filesusr.com/ugd/70d0b7_78c8ae01cffb45f9b8040c82edbed167.pdf?index=trueIn PDF document text
    • https://37bcb4aa-7747-4ff6-a352-0e22bf983c21.filesusr.com/ugd/4393d3_066214054d5b4247bc8cdc04764a0d26.pdf?index=trueIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_2e151d1fb00047fb9afe2180bd680f70.pdf?index=trueIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_224524f93b3c448a8d52b7523737fe5a.pdf?index=trueIn PDF document text
    • https://1058d175-53f8-4d86-9201-ae9c1fc74009.filesusr.com/ugd/62a633_bb28763e9b314b55ac737ed658ef9443.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEC 5084 bytes
SHA-256: e6719630ea3048c7cc7cfa94238265bbde0ecf684d3ece1f861791a60ee502f0
font_01_sfnt_off0000ff2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2E 11580 bytes
SHA-256: cd2458e053d43333ed404558dc1354091dd5977a7e7e9df3be87de9e7658f939
font_02_sfnt_off000126e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E3 16708 bytes
SHA-256: acc475967c70a78bc2cccffe2ffb64450d0cff0b161576c9e64305c0fff63dad

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