Malicious PDF — malware analysis report

Static analysis result for SHA-256 94461713c8d4dafa…

MALICIOUS

PDF

74.3 KB Created: 2021-02-03 04:19:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c5e41c9591fd53cdbc1a63e0fa5dbb8f SHA-1: e7ebe48f0806cfa2b8245aa2405fd05e63c4582b SHA-256: 94461713c8d4dafa0404811fb1431697f37661a6fdb0a0a06bc3918089ed9572
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the high ML score indicate malicious intent. While no scripts were explicitly extracted, the presence of many external URIs and the overall structure strongly suggest the PDF is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wb?keyword=benzyl%20chloride%20synthesis%20pdf PDF link annotation
    • http://twirlini.com/atlantis_terraform_workspacezxk4a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388063/normal_5ffa4d766bd48.pdfIn PDF document text
    • http://girlita.space/game_of_thrones_bluray_free_downloadof9fo.pdfIn PDF document text
    • http://narosisebono.22web.org/padopizusupinasunuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411694/normal_5ff3aef1368c8.pdfIn PDF document text
    • https://luxabilep.weebly.com/uploads/1/3/0/8/130873941/gilikafow.pdfIn PDF document text
    • https://kunoloxudiruk.weebly.com/uploads/1/3/4/7/134767428/vibun_dagubuxa_degaxalemuku.pdfIn PDF document text
    • http://remont-pc.website/beauty_for_brokenness8yu36.pdfIn PDF document text
    • https://lokawinopigu.weebly.com/uploads/1/3/2/7/132712062/96322d97.pdfIn PDF document text
    • http://makedctl.site/67037694022lpwts.pdfIn PDF document text
    • http://return-0.com/lifuserudabetivarizi3gqw7.pdfIn PDF document text
    • http://domastmsk.space/car_price_calculator_with_tax01oad.pdfIn PDF document text
    • https://pidowiwosuzaji.weebly.com/uploads/1/3/0/9/130969191/1f1e5db5394a3d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417306/normal_5fedc0adab455.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419430/normal_5ff3051a9f946.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vonopexurobuma.epizy.com/25946541096.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_off0000e618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE618 5236 bytes
SHA-256: ba75666109c184073849a227a06b5f79d9f560b31a38ec50db0be178a8e4ca0d
font_01_sfnt_off0000f7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F6 10788 bytes
SHA-256: bad27069bba6a6b9d9f91b0b5c02a066037e24c2a557ede0feb040ad40cd44e0

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