Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad587fc2d62f537…

MALICIOUS

PDF

76.3 KB Created: 2021-05-08 13:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c8153e0b72401ac2e208b7cca89bddf3 SHA-1: cb27503c3b2708b3ef5bb0f28a70533f33bed172 SHA-256: 5ad587fc2d62f53724298e19c16051d56499ee777aa21245462719e49eb011f8
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://fokemale.ru/strik?utm_term=how+to+determine+grade+of+ac+joint+separation PDF link annotation
    • http://alcexpress1.xyz/dasorudaratowlpid.pdfIn PDF document text
    • http://toxipoxekej.medianewsonline.com/linuzatexi.pdfIn PDF document text
    • http://sportplays.ru/18963211909ohyi7.pdfIn PDF document text
    • http://nikaold.site/fipasadugetelaluzozigaptki09.pdfIn PDF document text
    • http://yozi.store/57568057523pz73.pdfIn PDF document text
    • http://excschool.ru/dabewowupironojamulan21y4k.pdfIn PDF document text
    • https://kazazurijufom.weebly.com/uploads/1/3/0/8/130814205/jodefirude.pdfIn PDF document text
    • https://punelita.weebly.com/uploads/1/3/4/6/134679726/8c8cf44113.pdfIn PDF document text
    • http://bexowobiminefi.mywebcommunity.org/dikab.pdfIn PDF document text
    • https://fixivure.weebly.com/uploads/1/3/4/8/134888316/vujilopifujo-rigudubamutejin.pdfIn PDF document text
    • http://pofuxubilet.sportsontheweb.net/divine_mercy_chaplet_chant.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://651f5d5e-5f42-4fb0-8380-889764ca350f.filesusr.com/ugd/b2f7c1_900ac00a5b1341c6b93de600129a6824.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ee2f8cf-befb-4736-aff9-bbd012c4298f/las_batallas_en_el_desierto_resumen_capitulo_4.pdfIn PDF document text
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_7280ea2c91cc4f35abccd1b6e21cae5a.pdf?index=trueIn PDF document text
    • https://1f2f8e77-98df-4c5e-b88a-83bc2b612b58.filesusr.com/ugd/5c7528_d5562414ae38415da2af54466e1a6dce.pdf?index=trueIn PDF document text
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_1541398f1738403f80351fb0ea0a0391.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5f70081-8684-4c28-a325-5a62071b7403/how_to_learn_computer_basics_in_kannada.pdfIn PDF document text
    • https://48e5b1ff-25fb-49a4-826b-3ad3f3a15688.filesusr.com/ugd/0d632a_a48194480c5747f1a1382ec5b05db9e6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceaab0df-d627-43eb-9620-8eace4507c47/used_vehicle_inspection_form_template.pdfIn PDF document text
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_ad5bbd3c9a49470c97d4139b73e5c31d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ca55f51-89f9-4108-9dff-2fe063caeb53/honda_scooter_repair_near_me.pdfIn PDF document text
    • https://89d37d93-eaf9-4fc7-8d5e-07438b8f18e7.filesusr.com/ugd/e80f4c_4811e40d1e094d41b348b85fbec7ef9b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ab62594-0862-4e21-9165-44698fd4a2bc/hp_officejet_6700_printing_with_depleted_cartridges.pdfIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_44f21cc76aac451f8586e2ae5745d28b.pdf?index=trueIn 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_off0000edd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD9 5572 bytes
SHA-256: 66cd99ed0bb7a554217b5decbe1f7e960b46b4343da707bb6c7bd3f83f5412aa
font_01_sfnt_off000100cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CF 10280 bytes
SHA-256: 2968771ad9bf7c66f5519bb450c1409ec8952178469734f785217d9a79fa01fc