Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3930a0cf4018d26…

MALICIOUS

PDF

86.4 KB Created: 2021-06-10 16:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7a6f6681bd904a5fa87899b1a81ab76b SHA-1: cf775ac453636914134e5f033d03a31c70e920bc SHA-256: a3930a0cf4018d26dcc1dce4813aca1b915f5bea30cc2e02101c0264b5c5965d
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 0.9997

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://krisoc.ru/pbw?utm_term=sweat+equity+term+sheet PDF link annotation
    • https://kelodulelonax.weebly.com/uploads/1/3/4/6/134644310/wavudiwajodu.pdfIn PDF document text
    • https://laxabuzataz.weebly.com/uploads/1/3/4/3/134385801/1555154.pdfIn PDF document text
    • https://sutesesa.weebly.com/uploads/1/3/4/8/134871168/cea0f1ce08a1.pdfIn PDF document text
    • https://memuwumobodedo.weebly.com/uploads/1/3/5/9/135974490/63f474.pdfIn PDF document text
    • https://wetebaxa.weebly.com/uploads/1/3/4/3/134343617/duloru-dogobar-wopopisox-xawuxatuj.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/846b11f7-61ce-49b1-81b1-bfff497e9e33/28569292502.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae11a9d0-dcb3-4983-b401-96f6d381e323/how_to_use_the_self_clean_on_my_ge_oven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a32bdf41-ea6c-4cc5-8e9a-0cd8838991ad/71551286068.pdfIn PDF document text
    • http://xeninexiruvo.pbworks.com/w/file/fetch/144832107/lumebep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ed78d60-f73c-422c-a9b5-ad2d28cb3f8a/84224819240.pdfIn PDF document text
    • http://nudenuxote.pbworks.com/w/file/fetch/144981108/29619600055.pdfIn PDF document text
    • http://pamijokoja.pbworks.com/w/file/fetch/144775689/95972248536.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da90ee08-fe85-4d48-84f9-2a17514aea03/dls_hack_profile_dat_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aff29236-de88-47e6-aa23-9b50ccd7ea8a/favozifedorew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4918d554-986a-4d49-8a09-ee9c50f5fc1c/78953518820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e83c41a5-fd51-4ee9-87af-246e0ecb8a84/how_much_is_dale_earnhardt_stuff_worth.pdfIn PDF document text
    • http://rupebaxo.pbworks.com/w/file/fetch/144843009/78006339093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b4fa4ba-b59c-4d1b-84c8-230032a5ea03/nexikevojonijuzeko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/154e06e3-849b-465c-8558-9a509f1f6b73/vilimepakepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bbf33e2-bfeb-48b7-b3c5-5825b850453f/what_does_the_number_111_mean_in_love.pdfIn PDF document text
    • http://nefusim.pbworks.com/f/jealous_guy_piano_sheet_music.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_off0001152e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152E 5316 bytes
SHA-256: eee292f6275acf4a9016c68e09a761ab6af1fe4bbf378feb2ad5be74068c37b7
font_01_sfnt_off0001272f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272F 10868 bytes
SHA-256: 220463b7ca113d647e8e6c0e1ddf812fc31093b364d22032062108a6ec8ae23d