Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a4256a174680e7a…

MALICIOUS

PDF

64.8 KB Created: 2020-11-19 17:08:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3c0cba0243a4db46ec8aec11efb95cc3 SHA-1: d20b2d8a64fd59b2c846175f0a5ae18d32f13814 SHA-256: 1a4256a174680e7a19afa42ed407e0cff698de5f7533b468e08818f8803ce135
216 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including brand impersonation for credential phishing and a large number of external links, suggesting a link farm. The presence of embedded URLs and the ClamAV detection further support its malicious nature. The document body, though truncated, contains text related to account types, which is likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://webegerux.weebly.com/uploads/1/3/4/7/134759049/7209859.pdf.
  • 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://trafftec.ru/strik?utm_term=what+type+of+account+is+unearned+revenue%253F PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365657/normal_5f8e48eb69e6d.pdfIn PDF document text
    • https://webegerux.weebly.com/uploads/1/3/4/7/134759049/7209859.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401694/normal_5fa4c4404c3b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402244/normal_5f95abfcb64c2.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/genedonapubefe/theoretical_probability_worksheet_kuta.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/fur_elise_easy_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/nevekagofepevubu.pdfIn PDF document text
    • https://s3.amazonaws.com/luresimosip/whiskey_words_and_a_shovel_publisher.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/kanexe.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/lelidafenewukipek.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/toxixeletabefo.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/happy_color_app_download.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/random_minecraft_build_theme_generator.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/69633593240.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_off0000c2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2BE 5528 bytes
SHA-256: 490fa7cd4b7d7dc22a799417a217e14e3e34dd0a003c46d22722fe93f1889396
font_01_sfnt_off0000d5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A1 9576 bytes
SHA-256: 4e59c7ae51c4ad9439e2d637a1d98360eec79f77efb0f451cdb87ac921934898

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