Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3810185c17087d8…

MALICIOUS

PDF

77.6 KB Created: 2021-04-30 20:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e2a8209bacdb20f530134ac488b54bb3 SHA-1: dc967994b799107c0dec07487f3599fb3a209bc5 SHA-256: b3810185c17087d8c1f593b0f7b72f96e86b9060b058ecf3a02ae51ab7e7df79
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 hosted on disposable domains, suggesting a link farm intended to direct users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URL `https://lozipotod.ru/strik?utm_term=how+to+calculate+interest+on+loan+amortization` is a primary indicator of the malicious destination.

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
  • 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://lozipotod.ru/strik?utm_term=how+to+calculate+interest+on+loan+amortization PDF link annotation
    • https://rimuzomidaz.weebly.com/uploads/1/3/4/3/134353295/jukif.pdfIn PDF document text
    • https://cdn.sqhk.co/pigalixow/H7jdthh/nitipuge.pdfIn PDF document text
    • https://tufuziboserivu.weebly.com/uploads/1/3/1/6/131636644/wezari-zulolegok.pdfIn PDF document text
    • https://lufasewobomitod.weebly.com/uploads/1/3/4/7/134730449/3252916.pdfIn PDF document text
    • https://mejekuveko.weebly.com/uploads/1/3/5/3/135392268/xerogibox_tajuviwinefiz_xadexizateguda_vugotufi.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/Diia0gg/nanoral.pdfIn PDF document text
    • https://cdn.sqhk.co/mokabawimav/gibJXra/cops_and_robbers_mine_mini_game.pdfIn PDF document text
    • https://cdn.sqhk.co/fogibadeku/mrQhjji/khan_academy_math_practice_sat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5e024257-ca51-40df-b6b5-a3104c7b7124.filesusr.com/ugd/97368a_745d7d3bb6734a5dafe9c72c25ccec6c.pdf?index=trueIn PDF document text
    • http://punolubumima.epizy.com/67827286419.pdfIn PDF document text
    • http://zazezinokigane.epizy.com/hr_questions_and_answers_for_interview.pdfIn PDF document text
    • http://dodemupisam.epizy.com/cellulitis_pediatrics.pdfIn PDF document text
    • https://3012fa3b-51b7-4264-898e-e15d6fab1eb1.filesusr.com/ugd/ee5524_e18be982bc49452688734705c4a3d191.pdf?index=trueIn PDF document text
    • http://ximipine.epizy.com/arya_2004_songs_naa_songs.pdfIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_532512a4ee844056b958c01bb9f05dbd.pdf?index=trueIn PDF document text
    • http://kurevudofub.epizy.com/financial_analyst_interview_questions_and_answers_for_freshers.pdfIn PDF document text
    • http://sufutogikid.rf.gd/12753990120.pdfIn PDF document text
    • https://96a604d4-6f4e-42dc-90fb-b802e1cf4ed0.filesusr.com/ugd/6ef60c_a03539704fc447b1ad0688c889ca95ac.pdf?index=trueIn PDF document text
    • https://94db4134-5784-44c5-a63d-963e509970fa.filesusr.com/ugd/9c58c5_303e6b52cc4243afadb9d4f83c9d7d75.pdf?index=trueIn PDF document text
    • http://vojofixijiro.rf.gd/21653206107.pdfIn PDF document text
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_f5953f3b02664b2a884cc001afd6e557.pdf?index=trueIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_cc23093b584c4b9288ebc946189b7125.pdf?index=trueIn PDF document text
    • https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_793f34dc8690442c90cae75b16b05f75.pdf?index=trueIn PDF document text
    • http://jatomije.rf.gd/abandoned_vehicle_report_nevada.pdfIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_01d264c61e2640dd8ecfaaf9faa8cfeb.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_off0000f2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CD 5048 bytes
SHA-256: d82ef343b03bd453151f83629a1b19e03ec3843a1fa57e717a968d6b1e8d2965
font_01_sfnt_off000103f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F9 10604 bytes
SHA-256: 31e5f21e94fb449cb1e35211b640debbe15cac5496afd37ca30eeaff0af06831

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