Malicious PDF — malware analysis report

Static analysis result for SHA-256 a824220d80977e66…

MALICIOUS

PDF

82.5 KB Created: 2021-04-29 11:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 318be806a27ab632829b6343da6271b1 SHA-1: 521105bbf345cfe3e9572cc92ca14b1a656031ff SHA-256: a824220d80977e66a361498298814d0813f5b9a54bd3148caac851a261719e33
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file exhibits characteristics of a link farm, containing numerous external URLs designed to redirect users. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM firings indicate a high volume of links hosted on potentially disposable domains, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection further support its malicious nature, likely serving as a lure to phishing sites or malware downloads.

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://baarspo.ru/strik?utm_term=garmin+nuvi+3597lm+specs PDF link annotation
    • http://whalesqpa.fun/9128367652097lyz.pdfIn PDF document text
    • https://cdn.sqhk.co/pagozixupezi/e69ojaF/sejiled.pdfIn PDF document text
    • http://prizinsta365.online/48491574932lapax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366325/normal_5ffe2868a105d.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/hPQsSNX/zombie_hunter_costume_womens.pdfIn PDF document text
    • http://livecopyrightverification.com/fewagovokiwofadazul6t8wc.pdfIn PDF document text
    • https://cdn.sqhk.co/wofetewa/jj5gjgi/68960140767.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464871/normal_5fc969251fd9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477630/normal_6033ece362cdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494432/normal_603ff7286b5a6.pdfIn PDF document text
    • https://cdn.sqhk.co/nagigureti/hgghMja/3532000512.pdfIn PDF document text
    • https://cdn.sqhk.co/lopumilekana/hehbjep/reverse_pacifica_fanart.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_0bb829501ec74edebb81860501ca3bae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/70f45211-4899-4185-8f20-a5ac0d3aeb21/nordictrack_x7i_not_working.pdfIn PDF document text
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_5c7cacd738d34afc99aacee37cb8605b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a93dd883-2bb9-4d93-84c6-134133459620/what_is_free_will_according_to_philosophy.pdfIn PDF document text
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_f6992a9a731a4bd69bc462d202a475f3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c776b342-89e3-4e0e-abde-ec20db259c0a/how_to_use_the_instant_pot_duo_crisp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2534df32-a725-469a-89a6-86cb07da1e52/werewolf_the_apocalypse_20th_anniversary_edition_character_sheet.pdfIn PDF document text
    • https://1160a196-6e18-49bd-931c-438029629b47.filesusr.com/ugd/40338c_196efffe86284dc4a71f0a41fc383ce8.pdf?index=trueIn PDF document text
    • https://9480ebe7-8096-4165-94d5-b35dd525e9f4.filesusr.com/ugd/07b43d_d28646b0763f4fb096212b77b109278a.pdf?index=trueIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_e5af17cc01a8450e9db630530eaef4ae.pdf?index=trueIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_d35dc91f223b46ac967e890ea2723bda.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6bf0870-5f12-4cc8-b43e-d67edeed10f1/how_to_get_discount_on_dyson.pdfIn PDF document text
    • https://eecb1da5-82b7-48ef-90e5-6a20895c07e7.filesusr.com/ugd/88a84f_996643f9ee9a40c0b1e6a1ab48272115.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_off000101b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B1 5696 bytes
SHA-256: d4f93a23509d9b6488ad8ed5e34c3c7441e71e8ef127b613680b450c6a22dba5
font_01_sfnt_off00011511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11511 11444 bytes
SHA-256: 02b1e95ee6fda54035c877631adcce89291759e1a51ebd1989dc2662161d3848