Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1172199e85826b6…

MALICIOUS

PDF

99.1 KB Created: 2021-03-13 16:51:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56a8044ae3175a82c047d4a995a33aeb SHA-1: ba180a7d9428953b7f6e10864e6339aa87124763 SHA-256: d1172199e85826b6b2d0f0e256783631453b93fc2d9d80811467d343c1a1df49
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a large number of external links, with one pointing to a suspicious domain (vilenefex.ru), suggesting it's part of a link farm or phishing campaign. The document body, though heavily obfuscated, contains text related to an "Fda establishment inspection report", likely a pretext to encourage clicks on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/123?utm_term=fda+establishment+inspection+report
    • https://cdn.sqhk.co/wafudovop/gce1hcf/walkthrough_deeeer_simulator_2020_full_game.pdf
    • https://fitinunajixir.weebly.com/uploads/1/3/1/6/131637477/c65cd.pdf
    • http://devubowoku.mypressonline.com/the_pact_2020.pdf
    • https://cdn.sqhk.co/xovujiroveg/fwdIjaM/52046741822.pdf
    • https://baduxobenef.weebly.com/uploads/1/3/0/7/130739850/zewesewaxubus-juwuxege-xoriwen.pdf
    • https://cdn.sqhk.co/tosuwukiwate/hgfYhgZ/used_hang_gliders_for_sale_australia.pdf
    • https://bafexobis.weebly.com/uploads/1/3/4/0/134041027/7227817.pdf
    • http://vumamanepu.sportsontheweb.net/introduction_to_operations_research_11th_edition.pdf
    • https://popuverixi.weebly.com/uploads/1/3/1/4/131438274/lisekelewez.pdf
    • https://fulapelaz.weebly.com/uploads/1/3/5/9/135970028/lonesolaki.pdf
    • https://nolabuxovitu.weebly.com/uploads/1/3/5/3/135305824/xewodojonad.pdf
    • https://vanizubifimid.weebly.com/uploads/1/3/0/8/130874516/putosazedulopijefaze.pdf
    • https://cdn.sqhk.co/gewewoturila/gghh1gj/realistic_car_driving_simulator_online.pdf
    • https://wokopapun.weebly.com/uploads/1/3/5/3/135388848/xomuraj.pdf
    • https://bowilidorufe.weebly.com/uploads/1/3/4/6/134603038/1150592.pdf
    • https://cdn.sqhk.co/gavezexu/YzvgFji/ups_goodyear_hub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/napejaxosinages/can_you_use_wireless_airpods_with_android.pdf
    • https://s3.amazonaws.com/wurivuve/54792520891.pdf
    • https://s3.amazonaws.com/nedijowewoded/remidowezuwigaz.pdf
    • http://fejonaxi.myartsonline.com/virginia_condominium_act.pdf
    • https://s3.amazonaws.com/xifabilejilab/the_poisonwood_bible_genesis.pdf
    • http://wififeju.atwebpages.com/rororifadulufilux.pdf
    • https://s3.amazonaws.com/norozovijalu/guitar_chord_blank_sheet.pdf
    • http://xowilewegiwo.myartsonline.com/paint_3d_how_to_edit_text_box.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001482e.bin
6282c1c19dd32c71e5a8c1aec5f87b43e7d83d461d2479669f300ba625cb557c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1482E 5408 bytes
font_01_sfnt_off00015a5e.bin
d8756b11bc7c5f87ddb312d4d0ff4e95524e3c4f1a3fb41c3f3fef5a62b97faf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A5E 10716 bytes

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