Malicious PDF — malware analysis report

Static analysis result for SHA-256 a29266a0f7559351…

MALICIOUS

PDF

80.0 KB Created: 2021-03-08 17:39:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 579f6ca0fd5ef2034ab0d5c3ca21ed15 SHA-1: d8d9ee0d96baf4a5dd237d5a75417f33ecf4af15 SHA-256: a29266a0f7559351cf8b558a7371fe239d35417e271a60094f15096a82a64bf1
186 Risk Score

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 0.9954

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://dafemum.ru/123?utm_term=farming+simulator+17+guide+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367268/normal_6016589b963c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387419/normal_5fe26e5b76b72.pdfIn PDF document text
    • http://lirinevewafa.mypressonline.com/cuanto_es_1_93_pies_en_metros.pdfIn PDF document text
    • http://fafikup.scienceontheweb.net/what_does_person_before_the_law_means.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454290/normal_6031ceb5b2d49.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391340/normal_5fdfdc9b87f1b.pdfIn PDF document text
    • http://manovina.mypressonline.com/vafibogevorimiwabawikedi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/bokunafidene.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/linux_android_emulator_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3048379c-06d4-4d68-9e0b-12b7d269553b/basazopobarebedetamoka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d51cecef-1866-4353-9b0f-1e134337fa0f/wiragobuzonuparabe.pdfIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_72861befc4a74d19a81e27054fddf780.pdf?index=trueIn PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_250edceeac7545a8b443862d509b8a9e.pdf?index=trueIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_782794b3c83848bea6e56792f83343b9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/differential_calculus_limits_problems_and_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/aambala_movie_songs_starmusiq.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/017d7088-084b-4434-be85-317813ec4ccb/how_to_clean_small_engine_carburetor_without_removing.pdfIn PDF document text
    • http://xipanizi.myartsonline.com/patogizepax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7d6ba53-80aa-4bc9-9490-4cf401a8c252/76846164786.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f472e969-3aa2-46e5-ac60-7ac7d68f54b7/votisibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/434ed66e-29f5-4c21-80d4-73bdf9128787/fender_passport_250_plus.pdfIn PDF document text
    • http://gozidonozali.myartsonline.com/rogazitoxixesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/613c56db-f320-47bd-af3d-518980e84ef3/referat_modernism_vs_traditionalism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a020002c-bae4-46ab-95d4-c567f213decf/wafekifoposewiradigi.pdfIn PDF document text
    • https://587b455d-cc79-4428-8e80-a8b75ce23bca.filesusr.com/ugd/021ec8_7f32cb19cf2d4b43b639d9d235cddaa8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/153b5460-5211-480d-ab54-e5b3dde6bc05/18564365260.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8F 5332 bytes
SHA-256: d216eec75f90ffe1dce9b8ea6c1b55a038675acb592dbd115776085b391e3869
font_01_sfnt_off0000ffa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA4 10668 bytes
SHA-256: a512aa8dbb4b0303ead0042983380a7f7cb83ddf208e522c026a41298a3426ba
font_02_sfnt_off00012428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12428 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378