Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4f4c2e17338996…

MALICIOUS

PDF

72.8 KB Created: 2021-02-24 13:11:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: ee83a567e6e194bad7f23871e88ed8cb SHA-1: f381bf99f6d06a5e9157aad1dc13335ad9598567 SHA-256: ab4f4c2e173389967a04e1e0b1a167dd417afa28f077b65bfce5d16bc2a9129e
224 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating phishing and a link farm, including brand impersonation (Yahoo) and a large number of external links. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to budgeting, likely a lure. The presence of embedded URLs and the PDF structure point towards a phishing campaign designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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://zivexuxa.weebly.com/uploads/1/3/1/8/131871677/zodaz.pdf.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=which+of+following+is+not+a+benefit+of+budgeting PDF link annotation
    • https://zivexuxa.weebly.com/uploads/1/3/1/8/131871677/zodaz.pdfIn PDF document text
    • https://jutarufuro.weebly.com/uploads/1/3/0/7/130775772/4f638.pdfIn PDF document text
    • http://znasila.ru/656735732360px28.pdfIn PDF document text
    • http://xudogiborijum.66ghz.com/turbo_manager_app_for_android.pdfIn PDF document text
    • https://xebejadeveroj.weebly.com/uploads/1/3/0/9/130969735/kifokuxanigel-dozadosakaxami.pdfIn PDF document text
    • https://jadipiruw.weebly.com/uploads/1/3/0/8/130814676/5155788.pdfIn PDF document text
    • http://pearhaidhr.fun/earthlink_webmail_help_desk386mi.pdfIn PDF document text
    • http://helplnstagramoffice.com/85072153586gop1t.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/bipepezuwed/60417024358.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/financial_reporting_jobs_in_pune.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/conformation_of_cyclohexane.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/flex_head_mattress_sheets.pdfIn PDF document text
    • http://wifejijedop.rf.gd/neluvopofikuwawevute.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/composition_notebook_100_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/gojudiserixitobaselakuso.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/how_to_screw_wood_planks_together.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_off0000dd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD56 5432 bytes
SHA-256: 7c38208794eacd649f81f1db1d25c050f4eae26a8a72223b225a93e9beb56e95
font_01_sfnt_off0000eff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF5 11260 bytes
SHA-256: f3f7adcaa7e21738b6cc9573f847d12671f5080a266f278f1137c0ac50286965

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