Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ba5fb338f6d27b…

MALICIOUS

PDF

76.7 KB Created: 2021-03-26 09:25:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9db82cf6ec8c3d20e6dc92fc448e3927 SHA-1: 5247b02a8fb47504f22e00239f09f1a68080807f SHA-256: a9ba5fb338f6d27b87b9251859f3dd20b06ab035eff038e79b7bce1d5dd7a975
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 0.9999

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://xezojetit.ru/123?utm_term=api+crude+oil+inventory+report+release+time PDF link annotation
    • http://ig-socialmedia.xyz/az-_500_dumpshji71.pdfIn PDF document text
    • http://4kuhd.me/88894531176azwye.pdfIn PDF document text
    • http://custits.space/zogalupibawert0u.pdfIn PDF document text
    • http://gutprod.xyz/poweramp_equalizer_settings0ct38.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://01ff271a-2d66-4e22-ac0f-a796646d2f56.filesusr.com/ugd/8d93e9_a3d1c05bf74040e4a7f4b6753c8646c3.pdf?index=trueIn PDF document text
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_033e9175d8e14a249548525131292df5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6232b9e7-9e6d-4475-865c-e8a9c8bba757/66929992267.pdfIn PDF document text
    • https://d25e5d79-f3dc-43ab-8538-58f2f4730235.filesusr.com/ugd/898300_28bd75e3aa0645a3919b1ed02c5656c3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a247a8c3-98d9-4c97-8e00-e1d6e01b5ae7/types_of_structure_in_literature.pdfIn PDF document text
    • https://cc0b58a5-7bf4-4b41-9cd7-d9bc0cd2cc6f.filesusr.com/ugd/6dc98b_1da8f4b69cd04ff7a115aaa24c03fdf0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/12915791483.pdfIn PDF document text
    • https://82656f1f-dd0f-4426-89ca-c5688288f975.filesusr.com/ugd/56de54_39c99fd565144d5194504d7f80ee29b0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/moto_bike_racing_game_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96f0334c-597b-4ab0-a76b-f79d623c24d6/how_to_take_apart_ipod_nano_4th_gen.pdfIn PDF document text
    • http://kadanokadija.epizy.com/abacus_maths_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52e04eb2-6b18-4fa5-bd57-ee51ed79a5f9/how_to_turn_on_navien_water_heater.pdfIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/29277832930.pdfIn PDF document text
    • http://fakonin.rf.gd/sowodasasupobu.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_off0000ebca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCA 5372 bytes
SHA-256: 12e3da4fc6361f9a4e229782899720b5c7da79f8fdee0500f906ea019d4b54f6
font_01_sfnt_off0000fe04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE04 11068 bytes
SHA-256: ca9e7bfa9c52e4af1e4bb97162a7473d297d86504b90119c335e576f0efaabfe

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