Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfeb29883e9861be…

MALICIOUS

PDF

80.3 KB Created: 2021-05-26 06:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d24701fe7e19cf5c6a251826c0d33184 SHA-1: ce9f7031b96935f0b1dba15d9d4c8b5a73677acb SHA-256: dfeb29883e9861bec9b8a7edc51f566017ed987210584ccc366137281142d424
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF link farm. One of the primary external URIs, 'https://crophysi.ru/strik?utm_term=diferencia+entre+metodo+pert+y+cpm', is suspicious and likely leads to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://crophysi.ru/strik?utm_term=diferencia+entre+metodo+pert+y+cpm
    • https://zikagedatudupoz.weebly.com/uploads/1/3/4/2/134266226/9876869.pdf
    • https://litodamun.weebly.com/uploads/1/3/4/7/134710511/dezasimuz-mijusaz-fadamexukoxa-katodaxopedem.pdf
    • https://nelejezubifub.weebly.com/uploads/1/3/1/4/131406077/2485414.pdf
    • https://zanebereraba.weebly.com/uploads/1/3/4/4/134472179/sizobilogivivef_kovonelixuralox_romin.pdf
    • https://gilinolejokakis.weebly.com/uploads/1/3/4/6/134632374/2c96e3d4.pdf
    • https://lezigumaluneluw.weebly.com/uploads/1/3/1/4/131454696/6f0bdd4.pdf
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/43c255b9c2b1225.pdf
    • https://lexeparuma.weebly.com/uploads/1/3/1/3/131380616/8390269.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kulinisokakewi/sagonopof.pdf
    • https://s3.amazonaws.com/fikuvine/twitter_icon_vector_free.pdf
    • https://uploads.strikinglycdn.com/files/dc82e7d4-3d62-4c91-b6dc-b10e550e67ed/85345907950.pdf
    • https://s3.amazonaws.com/pisik/american_wire_gauge_current_rating.pdf
    • https://s3.amazonaws.com/xefezesebusu/musica_abiude_engano.pdf
    • https://s3.amazonaws.com/pukiza/uc_browser_mini_filehippo.pdf
    • https://s3.amazonaws.com/pasutiz/90386363508.pdf
    • https://uploads.strikinglycdn.com/files/6ac8a26b-9f19-4217-8740-257291b8fd5b/fuvifojatas.pdf
    • https://s3.amazonaws.com/somamere/dice_template_vector.pdf
    • https://s3.amazonaws.com/bivanud/30084316023.pdf
    • https://s3.amazonaws.com/xeropizuwe/67953579759.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_off0000f0ba.bin
de9d98f0ff55dfe9573bc4cec3e4dd960470b1190c70de85c7ad8727262bdb31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BA 2256 bytes
font_01_sfnt_off0000fb0c.bin
d000ec670f57613f35ef1ab0f1411c38850de6d205d5b2cb986f224b9326082c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0C 5192 bytes
font_02_sfnt_off00010cb5.bin
947c901ef0d4e8fe11ff37bf8c5c3ae73df0017b851e19d0318bfab5388a4029		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB5 11424 bytes

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