Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8684fcc710bb274…

MALICIOUS

PDF

75.3 KB Created: 2021-04-08 01:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 77a81c7621b7b1b698ee67bce2295978 SHA-1: 92f10d5c06b64e2112fdd082d2bf884c7278b71c SHA-256: f8684fcc710bb2741fe52990c8d69fff475ae66503b00caed272f45022c8d220
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The presence of embedded URLs and the heuristic indicating a link farm on disposable hosting strongly suggest a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF format can embed JavaScript, which is often used 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://nipisod.ru/123?utm_term=logic+gates+project+report PDF link annotation
    • http://vedice.ru/36165536010aktsp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407998/normal_602eeccd52a4d.pdfIn PDF document text
    • http://jiwabozaxexe.mypressonline.com/subway_map_ny.pdfIn PDF document text
    • https://fuxopejebema.weebly.com/uploads/1/3/4/0/134018858/6859179.pdfIn PDF document text
    • http://runojiwum.getenjoyment.net/breeches_pattern.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474456/normal_6020c2523633d.pdfIn PDF document text
    • http://auto-agents.space/reflector_3_crackhloj0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368245/normal_5ff539fb37923.pdfIn PDF document text
    • http://legiontry.online/97933527531wptgu.pdfIn PDF document text
    • http://dibosezufo.getenjoyment.net/gefakonaz.pdfIn PDF document text
    • https://fafutetigav.weebly.com/uploads/1/3/0/7/130775448/rutivozuravifope.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462038/normal_5fe618dc23f94.pdfIn PDF document text
    • http://tunewejewuz.mypressonline.com/software_innova_3160_brake_bleed.pdfIn PDF document text
    • http://xamoxipuwizutux.scienceontheweb.net/how_much_is_my_disney_collectible_worth.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464700/normal_5fc9557f6bcda.pdfIn PDF document text
    • https://kugibunil.weebly.com/uploads/1/3/1/4/131437599/desasu_sedudusi_visimigus_mazof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_b164589f5f6e431187d9189b8916c697.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wolina/13782105469.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/27485878775.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/sotabofibefop.pdfIn PDF document text
    • https://0a01f052-6ee6-4bfa-868d-d2e49373b03f.filesusr.com/ugd/55f640_d00905a3524f4f5c81d00b762ee7fc83.pdf?index=trueIn 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_off0000ea6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6E 5084 bytes
SHA-256: 1bac44fb84b98a03ba0444271200a115c5fc056142bc899afe5dc74a00477bee
font_01_sfnt_off0000fbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDD 10688 bytes
SHA-256: b23b8e862754b26fdad9b5210b6fdf175890d91498063e98644e3d1e8802440e

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