Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad09b45681855a4…

MALICIOUS

PDF

75.1 KB Created: 2021-03-26 05:37:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c3fdba2a680aaf58f4efadae0d022e3 SHA-1: bf04404583ee618b9ef6dc7d43d8566f33a67890 SHA-256: fad09b45681855a4148a3b9eb4e7df351961ab462dc91e28351974fa7ff2de4c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ponafet.ru/strik?utm_term=possessive+pronoun+exercise+for+class+4
    • http://wazofos.iblogger.org/browsec_extension_for_android_chrome.pdf
    • http://funofuzifige.iblogger.org/56467591314.pdf
    • https://wadasazaba.weebly.com/uploads/1/3/3/9/133999184/3863024.pdf
    • https://nunavataregexo.weebly.com/uploads/1/3/0/7/130775742/juzozesaribifena.pdf
    • http://gogejevi.iblogger.org/24889483350.pdf
    • https://totapige.weebly.com/uploads/1/3/1/4/131483287/da3b7c46858.pdf
    • http://biwinogivatize.22web.org/small_split_online.pdf
    • http://xodinazafomizi.22web.org/binomial_expansion_practice.pdf
    • https://japafapu.weebly.com/uploads/1/3/1/4/131437770/jegefojobed-vibape-dobizufir-xafuxefizex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_0684e7215f574265bcf43903fd47345b.pdf?index=true
    • https://s3.amazonaws.com/mejobu/obviously_mcfly_sheet_music.pdf
    • https://s3.amazonaws.com/jivala/adanga_maru_tamil_movie_songs_starmusiq.pdf
    • https://s3.amazonaws.com/pibabopuduj/magazine_background_design_template.pdf
    • https://s3.amazonaws.com/libusamagowuvo/angular_formcontrol_datepicker.pdf
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_086f6783723a42c89e7803d375c4a6b8.pdf?index=true
    • https://s3.amazonaws.com/jolituzoji/how_can_i_have_a_peaceful_life.pdf
    • https://s3.amazonaws.com/fowonaxul/sotexesoletaledefu.pdf
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_84566520558640c8afefccb1d61a1b16.pdf?index=true
    • https://s3.amazonaws.com/womirofop/garmin_520_versus_530.pdf
    • https://f62823ea-e863-4eb7-bd7c-e3bac0139ff1.filesusr.com/ugd/8c639a_6a15def89d0946e0a0c07400aca743bd.pdf?index=true
    • http://jabepujun.epizy.com/30291367892.pdf
    • https://s3.amazonaws.com/vitelitubovuluj/cwi_math_placement_test_study_guide.pdf
    • http://livufuxe.epizy.com/kekul.pdf
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_402b2d09d8584e3a87aa9ef903bed47f.pdf?index=true
    • https://s3.amazonaws.com/zasepo/tedupipujepikelivogemax.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_off0000e78c.bin
1c654509d4968598e5e7c1ef5383342201a739fb48f633a80ea8ef89fb4cdded		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE78C 5228 bytes
font_01_sfnt_off0000f97a.bin
02f45fc2ea8f915f8fc98e04b5759aff198050909c85af2c3774b4bcbabb33fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF97A 11132 bytes

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