Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1ad16f4556d440…

MALICIOUS

PDF

81.3 KB Created: 2021-02-23 11:01:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3b5c65a556dd4dd5d4f6485bd5ed68e0 SHA-1: 4930599d5cfe9995aa0d1777f5abbf73c498b3fb SHA-256: fb1ad16f4556d4407b77b80933d816237ff6c5d20c1b9a94523af039e41e1a7d
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources. The heuristic firings, particularly 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM', indicate a high volume of links, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=before+you+say+i+do PDF link annotation
    • https://cdn.sqhk.co/gogojelawov/hdhbdif/prison_escape_plan_foiled.pdfIn PDF document text
    • https://cdn.sqhk.co/dejijadu/fjig6Sq/17342482354.pdfIn PDF document text
    • https://gumotijilazu.weebly.com/uploads/1/3/1/6/131637190/ragulejalurabazobi.pdfIn PDF document text
    • https://dakopubelodeb.weebly.com/uploads/1/3/0/7/130775015/vozofipopozixevelo.pdfIn PDF document text
    • https://noruwapawufibem.weebly.com/uploads/1/3/0/9/130969999/5212463.pdfIn PDF document text
    • https://cdn.sqhk.co/monasomeb/g0ijjZK/76764091207.pdfIn PDF document text
    • https://varijiligedag.weebly.com/uploads/1/3/1/3/131383591/3924136.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/hiVgjdI/ates_ve_su_2013_oyun_skor.pdfIn PDF document text
    • https://cdn.sqhk.co/pobopuwubox/iVWfNxe/vumufavokuvoxajisubiti.pdfIn PDF document text
    • https://tapukinag.weebly.com/uploads/1/3/1/6/131606864/a8b1592d5c9.pdfIn PDF document text
    • https://kekufekogaj.weebly.com/uploads/1/3/4/7/134768560/bijaz.pdfIn PDF document text
    • https://cdn.sqhk.co/fetedudi/f9PhcWO/2939201444.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ropuba/77399474834.pdfIn PDF document text
    • http://dizoterimivitap.rf.gd/25253983440.pdfIn PDF document text
    • http://bitujavoza.epizy.com/driver_bluetooth_dell_vostro_3500.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/92135845468.pdfIn PDF document text
    • http://tejutavufoxif.epizy.com/peveborifobimube.pdfIn PDF document text
    • http://fogiwomagivizu.rf.gd/77536950337.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/here_i_go_again_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/how_do_i_enable_screen_mirroring_on_my_roku.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_off0000e537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE537 7548 bytes
SHA-256: 30701ee0f05dff9d7d52a94321278fa5ad0bcc2c8d59f69ae363ce018033c557
font_01_sfnt_off0000fe2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2F 5020 bytes
SHA-256: 7b3e0bb710070a665e9186b5bb343bdf8828e51bb5639908ed779c09b226e2b6
font_02_sfnt_off00010f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F60 11388 bytes
SHA-256: 07ee5d4bb979930ea49a532e1a8227bf1b27d3eaf838c8f20baa1532cc459c4e

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