Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05a3cdd02b730ab…

MALICIOUS

PDF

68.5 KB Created: 2021-03-14 08:44:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 000baa78ef3752ed55d802cf1bdc2009 SHA-1: 536bad7c3ee9f0d77dbe0a02ee6ad438c9d11c87 SHA-256: c05a3cdd02b730ab09225eb5fde4a5bf29746d6cc2b7884afbf225979cf105a8
176 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://druttle.ru/123?utm_term=sample+equifax+credit+report+canada PDF link annotation
    • https://cdn.sqhk.co/vomisape/77te2he/bonbon_cakery_ingredient_level.pdfIn PDF document text
    • http://vuzitofakomuj.22web.org/urban_dictionary_free_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvonazavo/oigmjb1/marketplace_mall_hours.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/24993464357.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/coca_cola_annual_report_2012.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/65456048547.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/11347578382.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/datasheet_of_lcd_16x2.pdfIn PDF document text
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_8023f133795049e6b0cb778e40da0c40.pdf?index=trueIn PDF document text
    • https://05491ccc-77c7-428b-9c25-74f2c6c50d4a.filesusr.com/ugd/d51d36_0181359dba304e949cae59e5513653f8.pdf?index=trueIn PDF document text
    • http://gamanavaje.epizy.com/92936528472.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/android_rpg_with_controller_support.pdfIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_9d3c6a06c77541d29d274bfa163f257f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/doxifuba/moreruxenenubujetiba.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/aditya_pancholi_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/16387910164.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/43952176336.pdfIn PDF document text
    • http://gekepogeje.rf.gd/tecnicas_de_redaccion_escrita.pdfIn PDF document text
    • http://fepujevuzal.rf.gd/icaap_guidelines_eba_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/jatovumi.pdfIn PDF document text
    • http://lugixevizopef.epizy.com/dumutukomujaforodo.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/noun_verb_adjective_worksheet_4th_grade.pdfIn PDF document text
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_8e14414f15c94034b3432d782a603ebd.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ced3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED3 5420 bytes
SHA-256: 6e15ebd5f6e4e6cdb60a2cf8bd67c2b34bc62fd85a3dfe3e957a62fe7354c5de
font_01_sfnt_off0000e12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12D 9976 bytes
SHA-256: 921c4afa1d7417686c70bd702e867119623f0c24186bdc04164fb13ef30b6332

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