Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ca1d1fcbba9912…

MALICIOUS

PDF

97.7 KB Created: 2021-03-04 00:48:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0cede6c82c76aef22d02d3e2db49f353 SHA-1: f349de161a2e11c03f97420981f351e86706c246 SHA-256: 78ca1d1fcbba9912bfccd9c66fadd97f158d690f9dc320570582e6cb5cec4e53
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with one specifically identified as a lure for 'target spiral ham cooking instructions'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam. Although no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://xezojetit.ru/award?keyword=target+spiral+ham+cooking+instructions PDF link annotation
    • http://reactivaperu-viabcpi.com/upper_blackfoot_river_idaho_fishing_report1i5w5.pdfIn PDF document text
    • http://pibarulajido.getenjoyment.net/rakaviwogowi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415770/normal_6035c3a5ccfc2.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/sound_search_for_google_play_ios.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382790/normal_5fedd763d17c5.pdfIn PDF document text
    • http://easycreditscore.info/93558929547nllta.pdfIn PDF document text
    • http://cz-nitrof.website/ap_calculus_ab_practice_exam_2018c8arp.pdfIn PDF document text
    • http://myluckybet.xyz/apostila_anlise_combinatria_e_probabilidadez7nys.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425784/normal_5fdd055526310.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/dowadotiju/bitbucket_server_backup_client.pdfIn PDF document text
    • http://kuwokezolofe.epizy.com/altera_quartus_2_free.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_off000140ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140EE 5360 bytes
SHA-256: c8114354e512dd1ecad9b7a06635ba26b2ff2dc660fa40f75a9af75379d7fce7
font_01_sfnt_off00015300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15300 11776 bytes
SHA-256: aecb6667ce6c5682372ec31fc1c35ba63c0ead8eec6337bb122036384a98b56b

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