Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1e0bfe244cb927…

MALICIOUS

PDF

80.8 KB Created: 2021-03-24 06:12:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bcffdd25150624dc20e29bca8aab5820 SHA-1: 8d3f06b33e9f3047b1a7d6d4df02ee8f6f7cb76d SHA-256: 4a1e0bfe244cb92786e1d449947590173454577d0075b9e2b8128101daec06ae
186 Risk Score

Malware Insights

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

The PDF contains numerous embedded links to external websites, many of which are on disposable domains and appear to be part of a link farm. The document body, though heavily obfuscated, contains text related to 'autocad certification' and 'autodesk', suggesting a lure for phishing or a scam. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=how+to+get+autocad+certification+from+autodesk
    • http://whalesqpa.fun/155192478924szel.pdf
    • http://agreevudb.rest/heath_anthology_of_american_literature515u7.pdf
    • http://shimano-stradic.ru/the_academy_the_first_riddle_game_downloadkqkhs.pdf
    • http://zedateve.mypressonline.com/baptism_by_immersion.pdf
    • http://musc-media.xyz/kenmore_he2_will_not_drain3ddoc.pdf
    • https://dekitinuro.weebly.com/uploads/1/3/4/8/134871397/tabekomidezut_rekebini.pdf
    • http://wabiferofuvud.mygamesonline.org/lijokad.pdf
    • http://vir-tus.com/nimupuzoburelovepitudike7r9jk.pdf
    • https://jedurabononip.weebly.com/uploads/1/3/1/4/131453193/7f943c7faaf21.pdf
    • http://warewakeb.sportsontheweb.net/widabisumukafado.pdf
    • http://gprofights.ru/adding_and_subtracting_fractions_2_answersdakxl.pdf
    • http://ejinaya.com/jar_of_hearts_pianovokjf.pdf
    • http://avit0.cc/6874481227439l8j.pdf
    • https://kofavuzaxo.weebly.com/uploads/1/3/0/8/130873868/1931039.pdf
    • http://epaytds.xyz/arihant_ethics_book_free_download8iyb1.pdf
    • http://fobexometoparu.iblogger.org/46274257561.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://2aa89031-56ac-4de1-b828-aabe99840ec8.filesusr.com/ugd/cf14a4_d4a724f50a734495a5fd09bdfabc2f7e.pdf?index=true
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_5ef2eafd956b401281ad9482a291bfbd.pdf?index=true
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_1abe684e07ff4028ad4588f26abdc0de.pdf?index=true
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_1039cbd5a2964698a47a08de1c831b7c.pdf?index=true
    • http://vobewegogiz.rf.gd/95260399280.pdf
    • http://xumametubedax.rf.gd/best_bodyweight_exercises.pdf
    • http://sewodup.rf.gd/binomische_formel_rechner_hoch_4.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eee9.bin
543c8dd3f44e05c589a38696cd52210e8e92100597d938a3668560d745e64d37		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE9 5308 bytes
font_01_sfnt_off000100f1.bin
9110cb35316793805029a1606df0599896844142c646bd0a6c52928de3a296d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100F1 11340 bytes
font_02_sfnt_off0001278e.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1278E 4324 bytes

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