Malicious PDF — malware analysis report

Static analysis result for SHA-256 4958efd988b0a1b2…

MALICIOUS

PDF

81.4 KB Created: 2021-03-25 13:15:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c19548b5f02ca4940553c1286b9b2ee3 SHA-1: 24fe1fd907d2b3aed688dc7aba9e70ad127d737a SHA-256: 4958efd988b0a1b2217633bdc76f744159fb1b35deec6169afd5927dfe35d30d
186 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for phishing or malware distribution. The PDF_SEO_LINK_FARM heuristic specifically points to this behavior, and the presence of URLs like https://jottigo.ru/strik?utm_term=tascam+dp+03 further supports this. No scripts were extracted, but the overall structure and heuristics strongly suggest a malicious document.

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://jottigo.ru/strik?utm_term=tascam+dp+03 PDF link annotation
    • https://cdn.sqhk.co/jezaziritav/eififig/sabado_domingo_song.pdfIn PDF document text
    • http://pomuropujuj.22web.org/gta_5_3dm_crack_crash_fix.pdfIn PDF document text
    • https://bigorofepomibed.weebly.com/uploads/1/3/4/4/134400252/62dfaca8.pdfIn PDF document text
    • https://cdn.sqhk.co/xolofiwano/gjhcgjc/oil_painting_color_by_number_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/pofaxexaxi/gdifKZs/shoot_the_duck_game.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/xlKibgj/xewamev.pdfIn PDF document text
    • https://jobadenel.weebly.com/uploads/1/3/1/1/131164033/7692984.pdfIn PDF document text
    • https://woviwawegar.weebly.com/uploads/1/3/4/3/134319486/tepuwuwomunif.pdfIn PDF document text
    • https://cdn.sqhk.co/nosuterib/gcgg1ic/bullet_league_2d_battle_royale_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vunalogivefu/ifAifwY/keto_chicken_goat_cheese_spinach.pdfIn PDF document text
    • https://dafizigupiteg.weebly.com/uploads/1/3/4/4/134492389/2459764.pdfIn PDF document text
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/mezabedewuwume-sabulupifametu-leselos-dened.pdfIn PDF document text
    • https://dimalosuzilem.weebly.com/uploads/1/3/1/4/131452887/36115915c5f5c0f.pdfIn PDF document text
    • http://fiwawuwexikixud.iblogger.org/99516787256.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://divonuniset.epizy.com/coloring_sheets_for_preschoolers.pdfIn PDF document text
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_3829eb2a833644738ab51004d59af5cc.pdf?index=trueIn PDF document text
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_8118f05804c54b6aafc73491e57a8939.pdf?index=trueIn PDF document text
    • https://ecfc1f44-6648-4072-bff5-6ee4adcfbe4f.filesusr.com/ugd/e5a943_855370c332a74d39a272d529d21f54ff.pdf?index=trueIn PDF document text
    • http://fopaguduvogo.rf.gd/29033720100.pdfIn PDF document text
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_9ff62aa7f44240399fc4a4ffa89d609d.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_off0000fa38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA38 5348 bytes
SHA-256: 8c8edeae576e178ffc2534766ab88612bae17e551e682059b2fd9ae2f8719fda
font_01_sfnt_off00010c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C54 14556 bytes
SHA-256: fc431d397c23c196de8e99bfed2b1ac4a76d48ef0e20acd95a76952a5edacd1f