Malicious PDF — malware analysis report

Static analysis result for SHA-256 b85a719bc026e380…

MALICIOUS

PDF

64.9 KB Created: 2020-11-06 01:26:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: d4382168fe3a44724cce4834073c0ee7 SHA-1: 23dddf68d5e72e28ad6655d7aafc99e385fab0df SHA-256: b85a719bc026e380beb54dc605cb9868181e07bdf3e9d98750351f55c0c68d89
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, with one prominent link pointing to a URL that appears to be part of a link farm designed to attract search engine traffic. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' strongly suggests the document's content is intended to deceive users into believing they are accessing legitimate information, such as a user manual, to facilitate an advance-fee fraud. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://trafficel.ru/strik?keyword=arb+elements+fridge+user+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367281/normal_5f879a870db31.pdfIn PDF document text
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/06706.pdfIn PDF document text
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/lerepomuxe.pdfIn PDF document text
    • https://vajibenutiw.weebly.com/uploads/1/3/4/4/134487234/zujoze_jimiru_vibamozijuz_gurenabifis.pdfIn PDF document text
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/lerunodejokawuloner.pdfIn PDF document text
    • https://pixipesigogod.weebly.com/uploads/1/3/4/3/134370637/jegoxe-wifunari.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/77cc699d-e3c0-4a9e-9956-51753f78bb67/totojeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37ed87c4-bfb1-4fea-b8ad-69b561ec231f/kexamexuwij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d75c6542-ec04-4f49-8eac-631d4b712f21/kugijonaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fa17220-f948-4475-9e72-7003d17345f0/menoetius_is_the_titan_god_of_what.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/496ec80e-818c-4550-b762-74d4637e8c69/urban_beatz_bluetooth_speaker_instru.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_off0000b9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CE 5356 bytes
SHA-256: e2ab96e156208b1740c509773ca9af497488caae17783866c4ae3b7d0bd69a1e
font_01_sfnt_off0000cbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE9 12724 bytes
SHA-256: ad7014dfbcd6e813183a03b262461ca6f33160ef1c1291c4f22f95a91499f678

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