Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b0494c6fa9ca31…

MALICIOUS

PDF

74.9 KB Created: 2021-03-14 12:41:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8e29498ae5bc117ff32e715907bc7b31 SHA-1: 0aea7a97855c98fec4c06f2809589614474a66b0 SHA-256: 34b0494c6fa9ca3135869363cc74f06fa3a64aeebd73406e1fe349aef7be0314
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates it functions as a link farm, directing users to numerous external sites, one of which is a potential phishing lure. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the document's structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://crophysi.ru/strik?utm_term=how+old+will+humans+live+in+the+future PDF link annotation
    • https://cdn.sqhk.co/dowusutitozi/dOSgcgf/70832668866.pdfIn PDF document text
    • http://lngcliente.com/pickaxe_minecraft_dungeonswspzh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490371/normal_60145a706d252.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479240/normal_5fda0bb7e518d.pdfIn PDF document text
    • https://cdn.sqhk.co/xolofiwano/eihg5Th/61043048424.pdfIn PDF document text
    • http://ita-bio.fun/13806024390p2i5e.pdfIn PDF document text
    • http://amorexpo.com/yahtzee_dice_masters05rxu.pdfIn PDF document text
    • https://sujolatako.weebly.com/uploads/1/3/4/6/134624807/236388fc222ab1b.pdfIn PDF document text
    • http://waystep.site/30528635114v9c6p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495043/normal_5fd03ba118079.pdfIn PDF document text
    • https://wepujemu.weebly.com/uploads/1/3/1/4/131453456/4925570.pdfIn PDF document text
    • http://carluxepaint.site/what_is_the_latest_edition_of_chicago_manual_of_stylec898e.pdfIn PDF document text
    • https://cdn.sqhk.co/webaxepibi/FuUijgd/79200373226.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402478/normal_5fcc3d998ffce.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_2b55673de0174916817504baa7bd2e5e.pdf?index=trueIn PDF document text
    • http://rijujala.epizy.com/action_words_worksheet.pdfIn PDF document text
    • https://9df6e0af-a028-4e88-91ba-61a1b37318d5.filesusr.com/ugd/7c1f05_ba9aa70f3aa342f69e9d3046ea5c4f55.pdf?index=trueIn PDF document text
    • http://botemexake.rf.gd/dexas.pdfIn PDF document text
    • https://fa0867c9-8cf0-46f9-bfae-aad8e49c21f3.filesusr.com/ugd/cdba2c_45dfda97cacd4a0691bf32cc9da7e3cd.pdf?index=trueIn PDF document text
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_4be8ff477f854531a81c03decc23950c.pdf?index=trueIn PDF document text
    • http://gazisemodab.epizy.com/prokaryotic_cell_structure_and_function.pdfIn PDF document text
    • http://kiwutixukunow.epizy.com/iperaldosteronismo_secondario.pdfIn PDF document text
    • http://zokemunerepefu.rf.gd/55103176544.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_off0000e7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AE 5260 bytes
SHA-256: 8f2ba7d47f5c9ef3d3d3c8dea2202f23c3a25c133463d3cc4eab31ccce2d585b
font_01_sfnt_off0000f973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF973 10680 bytes
SHA-256: a92e3d51c29f25bb4a25ab0f874928405a928702876f1f58865cba3c870629f6

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