Malicious PDF — malware analysis report

Static analysis result for SHA-256 a410c76baca62714…

MALICIOUS

PDF

95.4 KB Created: 2021-02-26 00:26:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c1513ea13432dab0cadf877e88abde8e SHA-1: 9caf94205cacb7cb1c729bb979432c9ab7f95c98 SHA-256: a410c76baca6271498c27125ab8619a343049c87893650b115953818ca4b31f3
186 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically for credential phishing. It contains multiple embedded URLs, one of which leads to a redirector for a Netflix-themed phishing page. The document body is heavily obfuscated, but the presence of external URIs and the phishing lure strongly indicate a malicious intent to steal user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://nadatipaj.weebly.com/uploads/1/3/5/3/135347779/1021290.pdf.
  • 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://jacksth.ru/award?keyword=immanuel+kant+views+on+human+nature PDF link annotation
    • http://btsworld.org/vatukorasikuzanauxm5u.pdfIn PDF document text
    • http://smartbright.club/rafigojiz8umr.pdfIn PDF document text
    • http://the-glow.ru/helix_waltz_clothing_guide8mdg3.pdfIn PDF document text
    • https://cdn.sqhk.co/jivumigen/bibpFie/hard_rock_greatest_hits_of_the_80s.pdfIn PDF document text
    • http://free-at.pro/bojobigitek7n284.pdfIn PDF document text
    • https://nadatipaj.weebly.com/uploads/1/3/5/3/135347779/1021290.pdfIn PDF document text
    • https://cdn.sqhk.co/kipaselofuza/jfjhjem/85147193888.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muloluj.rf.gd/11035533056.pdfIn PDF document text
    • http://desejole.myartsonline.com/how_to_train_to_be_a_barista_at_starbucks.pdfIn PDF document text
    • http://somaligebavaxu.rf.gd/26942530259.pdfIn PDF document text
    • http://kosidigipetuvu.epizy.com/2341149991.pdfIn PDF document text
    • http://gofosuxubajo.epizy.com/integers_word_problems_worksheets_grade_8.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/sample_grocery_list_template.pdfIn PDF document text
    • http://fesonukoropirum.rf.gd/front_office_organizational_chart_template.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B23 5076 bytes
SHA-256: 1a69430f871c0c27f8c15a43985ae894a5ff43014657163d20e3f887b1b283af
font_01_sfnt_off00014c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C49 10520 bytes
SHA-256: c6dcb0db6c8337af054f89050b878b8ad1fde3aea856ad46a4b5bdccc46a8263

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