Malicious PDF — malware analysis report

Static analysis result for SHA-256 a663d13761a5ec65…

MALICIOUS

PDF

82.4 KB Created: 2021-03-27 10:02:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 580859f94e0bbda688d49306d198348a SHA-1: a902930bc2ad19defcd0fdd01365ba09c256cb08 SHA-256: a663d13761a5ec65e570f88f348952ee7ce0e5d53aaba2c4e95837f8fb166dc9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://golowaki.ru/wix?keyword=bright+lights+big+city+pdf+free PDF link annotation
    • https://wuneregogituweg.weebly.com/uploads/1/3/4/6/134686440/naxebugipubuvir_nizis_fizila.pdfIn PDF document text
    • https://vewevemeza.weebly.com/uploads/1/3/2/7/132741136/leperata_firapoxemovex_dadeko_napokudiliful.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460042/normal_60212785251b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375071/normal_5fcd306291d23.pdfIn PDF document text
    • https://xikisujegowo.weebly.com/uploads/1/3/1/8/131856166/9db465b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445558/normal_5fd17109854f6.pdfIn PDF document text
    • http://rakuxijewimafud.22web.org/android_sdk_repository_bazel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460066/normal_5ff7157d70061.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_1f49f3bfa6e94cf892f13b21d4ed5eaa.pdf?index=trueIn PDF document text
    • https://d115d978-d96a-40c8-9764-5d959708fc35.filesusr.com/ugd/436160_829192e93f3843b7801cce64f81cc223.pdf?index=trueIn PDF document text
    • http://ferenekukosazu.epizy.com/c_a_p_full_form.pdfIn PDF document text
    • http://lozulunadiko.epizy.com/86989182570.pdfIn PDF document text
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_04866f5186954688b9e82a40c66bd94a.pdf?index=trueIn PDF document text
    • http://zapofekeba.rf.gd/mcgraw_hill_connect_answers_chemistry.pdfIn PDF document text
    • https://f579be4a-c2ec-451d-94ee-532237c06880.filesusr.com/ugd/9f6a24_7b907a1a76444fd4a3915d4a5f7cea9d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a778ab4-0019-4d43-99ae-387b7703147c/mirro_8_quart_pressure_canner_instructions.pdfIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_e68f6509e9a440af821dd6ada660eef7.pdf?index=trueIn PDF document text
    • https://b9387e75-0942-48a6-8a47-0bd3f0224277.filesusr.com/ugd/fc485c_621c28c3fd4b4ddd8d956e7a40614314.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2b43448-6cc0-44f2-b3ec-d5304c13e9be/what_are_the_greek_and_roman_gods_names.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_off00010225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10225 5496 bytes
SHA-256: 715c523837d4e3989672ec7ef25092e0def57ac67bcd58e171285589ed6044ce
font_01_sfnt_off000114e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E8 11980 bytes
SHA-256: 6e335650d4f058f827ae2e3c1d0067de3392559f148014344b1cdffcdcf5433f

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