Malicious PDF — malware analysis report

Static analysis result for SHA-256 4efa8f01a5360c14…

MALICIOUS

PDF

72.3 KB Created: 2021-03-25 09:17:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: dd4420e2bc62377f3ec4bfa7ce54c33e SHA-1: 104fbdbae186e0d727dfbd18a01ada9b41e95839 SHA-256: 4efa8f01a5360c14bbe23941a515ffba03b8985d231e93dd8404f44f101b82f2
134 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan payload. It contains numerous external links, with at least one pointing to a link farm hosted on disposable infrastructure, suggesting an attempt to distribute malicious content. The document body, though heavily obfuscated, appears to be a lure for educational materials, likely to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://golowaki.ru/strik?utm_term=grade+3+mathematics+workbook PDF link annotation
    • https://zodemabu.weebly.com/uploads/1/3/4/8/134896511/2671404.pdfIn PDF document text
    • http://static-start.top/girl_guide_cookies_canada_nutrition09wuw.pdfIn PDF document text
    • http://like-store.site/eye_diagram_worksheettuczq.pdfIn PDF document text
    • http://juzufezike.mygamesonline.org/adobe_editor_app.pdfIn PDF document text
    • http://zabavnyi-slon.ru/nccn_guidelines_moderate_emetic_risk5fmts.pdfIn PDF document text
    • https://risovokoxenixe.weebly.com/uploads/1/3/3/9/133997247/sibadev_vixivideko_tuboxefejepe_wegaxuweso.pdfIn PDF document text
    • http://amandeepsadyora.com/how_to_replace_brother_mfc-9970cdw_tonerep7af.pdfIn PDF document text
    • http://jubigale.scienceontheweb.net/is_sat_still_required_for_2022.pdfIn PDF document text
    • https://jurivulanikep.weebly.com/uploads/1/3/4/5/134525456/bivowiwufekitumedulu.pdfIn PDF document text
    • http://rijewomel.scienceontheweb.net/bumewejozed.pdfIn PDF document text
    • http://wumiwuzigimo.mywebcommunity.org/is_there_a_monthly_fee_for_verizon_jetpack.pdfIn PDF document text
    • http://vozajomaralamer.mygamesonline.org/little_drummer_boy_bagpipe_sheet_music.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/nisuvitunedorolezif.pdfIn PDF document text
    • https://vezevuxujobamo.weebly.com/uploads/1/3/6/0/136082964/netan_dijuma_jisigek.pdfIn PDF document text
    • http://sportplays.ru/73466154172o1vxp.pdfIn PDF document text
    • https://dufurewamefo.weebly.com/uploads/1/3/4/5/134595550/3d8906020a2dbb.pdfIn PDF document text
    • http://pemutoguxo.66ghz.com/62377072530.pdfIn PDF document text
    • http://kigumelez.medianewsonline.com/jonizetu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bodamuma.rf.gd/xuxugujixusojolil.pdfIn PDF document text
    • http://talagamezibupip.epizy.com/86631079657.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/bsc_nursing_syllabus_2018_inc.pdfIn PDF document text
    • http://pefodajisotavuk.rf.gd/nomoziwubesase.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/what_is_the_default_password_for_arris_tg2482a.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/call_log_says_answered_remotely.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_off0000dacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACC 5636 bytes
SHA-256: 6dbecdec3650e76cfa671550786a8103ff81f11497d19d91aa12a3c05920b066
font_01_sfnt_off0000ede2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE2 10592 bytes
SHA-256: 7dabfb29feff9edd8db172ab9225ed094f0857cf18dbbe5f67d59a8c84389d8c

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