Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a09046c6f0469ad…

MALICIOUS

PDF

71.5 KB Created: 2021-03-22 05:06:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0b94f96a418a12ee27cda11223763a16 SHA-1: 9dce10cb0f7c60728e14813d58a4664728597fa5 SHA-256: 5a09046c6f0469ad8d4bea4428e659a9acb6a1f54295969f2bd7631ec552879d
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://bologen.ru/wix?keyword=weathering+erosion+and+soil+worksheet PDF link annotation
    • https://cdn.sqhk.co/guwuweri/ifsikHy/saroxonuxerepekujel.pdfIn PDF document text
    • https://cdn.sqhk.co/liwewajawab/Zvhchiw/rusanepivop.pdfIn PDF document text
    • https://cdn.sqhk.co/nidebuwe/jc1gijb/coinbase_bitcoin_wallet_address_changes.pdfIn PDF document text
    • https://cdn.sqhk.co/tedigedubemi/hgi3Nih/ocoee_river_rafting_camping.pdfIn PDF document text
    • http://rolivazugatar.scienceontheweb.net/do_you_capitalize_than_in_a_title.pdfIn PDF document text
    • https://cdn.sqhk.co/jinuzekovodi/hihfeZz/pulixavuge.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f43304fd-85e4-489a-8612-81977e01be4a.filesusr.com/ugd/b6f504_4b832ea6e9b8424685dc11f1f31fb9cd.pdf?index=trueIn PDF document text
    • https://d54d55f4-8004-4613-9f19-7b96cbed0ae7.filesusr.com/ugd/ce4b32_cbbac5aaedce4f07a77af01499974745.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/megelugik/21383461778.pdfIn PDF document text
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_88f8d2ede5b044b3991a710aa3919353.pdf?index=trueIn PDF document text
    • http://kipejefanowisu.atwebpages.com/costeo_absorbente.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ab5d68b-a954-467e-8bef-71203f80e370/38429199216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73b93610-4784-425d-8802-cc07786ca5f0/pafufe.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/agri_fab_broadcast_spreader_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/when_to_replace_timing_belt_2013_honda_civic.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/punegowesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f426b8c-801c-4459-88ef-b19e65f848fa/are_hot_water_heating_elements_universal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01e99e19-3364-400d-a41f-a8ba1833a379/how_to_train_for_rock_climbing_beginner.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_off0000db40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB40 5256 bytes
SHA-256: 55b9ae8b1bd4a48ef957887ddb6e2ffa66ceffe68e7cd0b8c3fcc0940863c16a
font_01_sfnt_off0000ed2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2C 10372 bytes
SHA-256: 88a4553de17080cc257448d181d88447d89b7afd3e12ee346a5d4485d2ba7bdf

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