Malicious PDF — malware analysis report

Static analysis result for SHA-256 040c302c5194656c…

MALICIOUS

PDF

45.2 KB Created: 2020-11-09 05:03:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: 957787e6150ef2b18c0216548c921818 SHA-1: a51557fa41bf024742457a4486fdb19d7f546be0 SHA-256: 040c302c5194656c5f9b2cfb42dfb8c593f95699c83bf293c5a3828d0e928674
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffi.ru/123?keyword=is+iseek+answerworks+english+runtime+a+virus PDF link annotation
    • https://wuwuleli.weebly.com/uploads/1/3/1/3/131398564/kuzad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457311/normal_5fa8abf25f9b2.pdfIn PDF document text
    • https://gekilatati.weebly.com/uploads/1/3/4/3/134378061/b00d611f5e3.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/towakog/neuphoric_skin_reviews.pdfIn PDF document text
    • https://bimozevuve.files.wordpress.com/2020/11/kuroruzafeluregipozag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d1af2cd-14c3-4726-8160-389b36736207/9482664454.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/buy_here_pay_here_boat_dealerships.pdfIn PDF document text
    • https://kinuvazuruka.files.wordpress.com/2020/11/calculate_computer_glasses_prescription.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/princess_on_the_brink.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22023fd3-a000-4adb-8664-adf45b072972/10592346710.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/mosusagove.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/ebook_reader_fr_eigene_dateien.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ad3007c-9c60-4824-8794-a91bc573ca72/metallic_dye_ffxiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79b12daa-37a5-4486-a2ae-7dd1364a88a1/27417111742.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/us_history_map_activities_answer_key.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_off00006f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F56 5252 bytes
SHA-256: c77e1277aff0feead7f8274623d251db8d359a17fb8f4ad23fc3324acd728d71
font_01_sfnt_off00008122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8122 11332 bytes
SHA-256: c19b88228320cafbf04f51275a71e56753264b9ffbd40abc04ef94b3f0416ab6

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