Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d4cda2b6a176734…

MALICIOUS

PDF

87.0 KB Created: 2021-03-25 00:43:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5bbf4ac2015dc048fe66fbcc8e1849b7 SHA-1: 2c4668d26d9f8277485461c6b2f127805f885fa8 SHA-256: 2d4cda2b6a17673420381765e83b158fee7606009947d2f57293fcbdd421101e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a primary external URI pointing to 'lozipotod.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links on disposable domains, suggesting a phishing or spam campaign. No scripts were extracted, but the presence of embedded URLs and the link farm heuristic strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/wix?keyword=zarig%25C3%25BCeya+o+tlacuache PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4365562/normal_5fe4aa0746bce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457620/normal_60114aa031727.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416501/normal_5fe718865defb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459055/normal_5ff30f30080ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452385/normal_5ff711a754bd2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452395/normal_60097c5b28e14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447877/normal_5fe2980d29567.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/47510399025.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498348/normal_600f5dbcae151.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/zanawariranatedogev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2861492-1c8b-416d-84ab-361f54eebd16/lowrance_hook_3_transducer_installation.pdfIn PDF document text
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_651ff2c894824467a0dc97f50a88001c.pdf?index=trueIn PDF document text
    • https://5862e4ea-63a6-4c92-af93-e06d02d1a664.filesusr.com/ugd/eaa371_eb1f396b08b7484caa87f89ee74c4461.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/27ab352e-d648-403a-af52-99f0509247e5/what_are_the_taste_bud_senses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6678d604-1e4c-4d8e-966b-0bc77c897bc6/simple_drawings_of_flowers_in_a_vase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3785d5c9-b7ab-49fb-b579-14a220cbad1c/learn_spanish_books_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71e2e2f3-7a8e-4ba9-a495-8abef94675d8/84619265233.pdfIn PDF document text
    • https://s3.amazonaws.com/sojenozap/rifufexagadozafijibuzob.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/akhiyon_se_goli_maare_movie_320kbps.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/early_closure_letter_template.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/kidopilunenewonerato.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD18 5064 bytes
SHA-256: a6021992d1849f0cea9aaf2ce9e138b502926d583b7d665d8a7b0bc82bb72f59
font_01_sfnt_off00010e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E20 13080 bytes
SHA-256: 6e73827f873cab7ed121ff275bfdbe074969d7af8d99512c10a533928f49f332
font_02_sfnt_off00013833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13833 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90