Malicious PDF — malware analysis report

Static analysis result for SHA-256 7427c1e53a06e51c…

MALICIOUS

PDF

83.7 KB Created: 2021-03-23 03:07:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbca9cefaff74783c4e9d374f97df223 SHA-1: 9a457f3b2c5c024216cbb735bc0d6da45199dc0d SHA-256: 7427c1e53a06e51c2c76494096c12d2eca5f0d1cf55c617be5ff09221c3e283d
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and the heuristic findings point towards the document's primary purpose being to redirect users to malicious sites, likely for further exploitation or credential harvesting.

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
  • 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://midufefew.ru/123?utm_term=platform+bed+box+springs
    • http://workbykoder.xyz/gotepete04wh9.pdf
    • https://kavasudominid.weebly.com/uploads/1/3/0/8/130813783/01c69960220.pdf
    • https://morutasatosode.weebly.com/uploads/1/3/4/3/134366393/lulibawil-gisibafakom-wosidesad.pdf
    • https://cdn-cms.f-static.net/uploads/4462374/normal_6049cbbb046ce.pdf
    • https://faxigokoge.weebly.com/uploads/1/3/0/7/130775726/cb36998f8d.pdf
    • https://xofivexaroza.weebly.com/uploads/1/3/4/3/134321457/sunekas.pdf
    • https://static.s123-cdn-static.com/uploads/4418781/normal_60054ba01c920.pdf
    • http://useplafond.xyz/esquema_de_la_historia_natural_de_las_enfermedadesbm1zo.pdf
    • http://roskycnmx.com/what_is_the_purpose_of_a_deed_poll_in_trinidad_and_tobagoii7om.pdf
    • https://cdn-cms.f-static.net/uploads/4490722/normal_6055699212f3e.pdf
    • http://mon-cmso.best/kumejufefigadalabirzshby.pdf
    • https://kezexawu.weebly.com/uploads/1/3/0/8/130814062/3337749.pdf
    • http://lnstagramverifiedbadgeservice.com/busuximogavexorobixapinplee.pdf
    • http://contentmedialiteracy.com/ruvapepodezozurubulilwpbf.pdf
    • http://skout.tech/adt_pulse_apple_watch_not_workinglzdzq.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_61a89560b81040bea8807e3057196679.pdf?index=true
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_bef138a4f58143e9a5411dc5a8483f41.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5a0dbe47-419f-441b-9717-5f6fcc5091ea/how_to_sync_garage_door_opener_with_bmw_x3.pdf
    • https://uploads.strikinglycdn.com/files/4b4a9fa7-42f7-4ec7-9fdd-ae3d336a4918/how_to_use_the_food_dehydrator.pdf
    • https://uploads.strikinglycdn.com/files/320f8bfe-5e6e-4309-8a21-623f89546efa/69307098490.pdf
    • https://uploads.strikinglycdn.com/files/4ffea0c4-121b-47d7-9ae6-3204cfad95a4/instruments_in_the_redeemers_hands_ebook.pdf
    • https://41d9b059-0b17-466b-96e6-f31a3f3e9b19.filesusr.com/ugd/f1ead9_29cf5a4d808c45fd8dbae7a17795e490.pdf?index=true
    • https://uploads.strikinglycdn.com/files/af593d19-1033-4d17-a01e-377f45cb1697/the_yearling_1994_full_movie.pdf
    • https://a72b158e-cead-41d6-a0b3-8518216316a4.filesusr.com/ugd/35c6e2_5865624686ad42339442f9bccfc6e3b3.pdf?index=true
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_098c44cc9632494c836e14f9162cdf9b.pdf?index=true
    • 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_off000107fc.bin
cf26be5a32b9b98a0a3901d0d412e2f71b119b1c1da993ca2bd59cb789101a18
pdf-font-stream PDF embedded font (sfnt) at offset 0x107FC 5568 bytes
font_01_sfnt_off00011ad8.bin
366a86c1a463f477d60820c9de3dcc6b218ab083253aecb497194119c3e4e34b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD8 11376 bytes