Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e63521542ce124…

MALICIOUS

PDF

80.3 KB Created: 2021-02-08 21:41:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c0d14e2d7b92ed9eb5fecd4bcd0ef552 SHA-1: 29ebd8f40f2196c99a78b4c802b0b84caf417670 SHA-256: 73e63521542ce12452563c5f7c328b744077cd4d8153222e2a4a84e3a92bdf9e
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to redirect users to various potentially malicious sites, including 'http://rimka.xyz/taig_2._1._3xnim7.pdf'. The presence of external URIs like 'https://maypoin.ru/wb?keyword=public%20query%20dns%20information' further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://maypoin.ru/wb?keyword=public%20query%20dns%20information PDF link annotation
    • http://rimka.xyz/taig_2._1._3xnim7.pdfIn PDF document text
    • https://nopuxexej.weebly.com/uploads/1/3/4/4/134498230/bofimoziwovej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388426/normal_5fc82792eb0ce.pdfIn PDF document text
    • https://wubepifumemav.weebly.com/uploads/1/3/4/1/134109226/080806c423.pdfIn PDF document text
    • http://itawegan.space/scary_movie_1_download_dual_audioogb74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386079/normal_601465b10b17f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386848/normal_5fcdc1a973474.pdfIn PDF document text
    • https://dajidavibaral.weebly.com/uploads/1/3/4/6/134606929/zufipokebipaxawakaki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://goviragukipi.epizy.com/jazixonivofemaseligov.pdfIn PDF document text
    • http://xenuduximowub.epizy.com/car_navigation_app_for_android.pdfIn PDF document text
    • http://zusunikumejimet.rf.gd/alkaline_phosphatase_activity_bone_formation.pdfIn PDF document text
    • http://buwanizun.epizy.com/folikisepime.pdfIn PDF document text
    • http://vigiwadovu.epizy.com/pulmonary_hypertension_guidelines_2015.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_off0000facc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACC 5536 bytes
SHA-256: 615ed734a4c05b13515160102f930034a60d188041d5f899060689726312ec27
font_01_sfnt_off00010d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D88 10876 bytes
SHA-256: 6b606b7ed9d9dd528cdf792a6c601ebed33242f3ee4c67ceaf4d45276f0c53e5

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