Malicious PDF — malware analysis report

Static analysis result for SHA-256 369131091edeaa3f…

MALICIOUS

PDF

76.9 KB Created: 2021-03-11 19:10:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4dd5566c25f17d53c9a4d81686b1a604 SHA-1: 5b1ac96c845baee891c08f2842d0a583adbedde9 SHA-256: 369131091edeaa3f810662a97974bf1f457f9fda98c0aeff8d1d86d3ca6a2ba6
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 0.9991

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://kuzutuzo.ru/123?utm_term=metabolismo+alcohol+pdf PDF link annotation
    • http://rujitexoxobag.mypressonline.com/how_to_do_multiplication_in_your_head_fast.pdfIn PDF document text
    • https://cdn.sqhk.co/nimuxugemu/dygsbJe/current_carrying_capacity_of_14_awg_wire.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/iPie2gf/roller_skate_spacers.pdfIn PDF document text
    • https://cdn.sqhk.co/ponesigis/digie59/89534145294.pdfIn PDF document text
    • https://cdn.sqhk.co/molavagew/h0gjQgh/pefesamasetug.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/e2accd8e-a54e-48c0-9ee2-7fdc19624c19/percy_jackson_3_movie_release_date.pdfIn PDF document text
    • http://sulorowanutabu.atwebpages.com/virgil_abloh_figures_of_speech.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/what_is_bills_of_exchange_in_accounting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3b2c48b-5275-4bf4-bfff-d75e4f619d86/organizing_for_social_change_bobo.pdfIn PDF document text
    • http://bilisedutave.myartsonline.com/b2_english_vocabulary_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68903126-3c51-4674-aa71-a9254a3133ef/are_resistance_bands_good_for_seniors.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/72287413933.pdfIn PDF document text
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_c0b1b126e2354a9e856174fc2fe1f936.pdf?index=trueIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_d0be4ac80ef745f0a28dbae69310a9c9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/46b3d5ff-c1a5-4b0f-a926-49903364fad5/73155689443.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6ac05dc-0004-4c19-a2f4-01f1e09afb60/belokitafuxumugid.pdfIn PDF document text
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_b7a0b03ce60d429192a85b168b55a4d9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/all_souls_college_visiting_fellowship.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/hanuman_ji_ke_bhakti_gana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a7faab8-547f-44d8-b731-264de5e71a60/toro_824_snowblower_electric_starter.pdfIn PDF document text
    • http://dovunufesesiz.onlinewebshop.net/gonofazojas.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/b_a_pass_full_movie_filmywap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f11ebf86-7675-4f5b-8568-dd5aa263e8ff/how_to_play_16th_notes_on_bass_guitar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cdcec00-48e2-4aa6-9f57-a8351b539c2b/2006_infiniti_g35_transmission_fluid_change.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_off0000ef22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF22 5444 bytes
SHA-256: b194c88a15cb339be02d5bb8115bb5afbac44d784abfebb622856bfd80d2f879
font_01_sfnt_off0001018d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018D 10916 bytes
SHA-256: a941e333281363b20d54b9a2ba7d5c22c4df7fe4e8ee69174e0be3939d3f0514