Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82710aee7b2d36c…

MALICIOUS

PDF

81.9 KB Created: 2021-05-27 03:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2b2fffe7a0c1ecf2915e9a6756f31a92 SHA-1: b0147eb03028d1e89475fff580ad4b2970cf77ab SHA-256: f82710aee7b2d36c0ddfb854c2f92f1ede6011ecfc5f81bc6c75eab523f35966
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 0.9996

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://jacksth.ru/strik?utm_term=pubg+camera+sensitivity+settings+for+mobile+2020 PDF link annotation
    • https://lukigozijejis.weebly.com/uploads/1/3/5/3/135398738/5405367.pdfIn PDF document text
    • https://lofefogurabu.weebly.com/uploads/1/3/1/1/131164054/4ed5f.pdfIn PDF document text
    • https://xajimago.weebly.com/uploads/1/3/0/8/130813364/815363.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460066/normal_600ecde65435d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460463/normal_603497246226b.pdfIn PDF document text
    • https://vurerabekude.weebly.com/uploads/1/3/4/4/134493837/6453225.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529095/normal_605fb57ba2da0.pdfIn PDF document text
    • https://xatuguje.weebly.com/uploads/1/3/1/8/131856293/movisada_dodowa.pdfIn PDF document text
    • https://dekudabor.weebly.com/uploads/1/3/4/8/134893804/dokegexofoxiga-futeven-gefugoginebof-seketag.pdfIn PDF document text
    • https://sopazamiwurigu.weebly.com/uploads/1/3/4/3/134387891/nedoxivemere.pdfIn PDF document text
    • https://xezixopizanew.weebly.com/uploads/1/3/5/3/135314636/ginagipenanotev-misoteb-pojejo-dapijomubijeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388432/normal_603f0bfe19c7f.pdfIn PDF document text
    • https://vuligezu.weebly.com/uploads/1/3/5/3/135391643/mozipuje.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/48408003-4d94-4d6b-9acf-28fd91e21189/marionettes_inc_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/983a6355-b920-4971-b7d3-149a03eb69b1/reven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b65e093-f092-4cc9-a4c9-633d6bda766a/29429565238.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d8efc04-abbd-48d1-8f25-9ada3cffa8c8/can_u_work_at_baskin_robbins_at_14.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/490b74ea-fd5a-462b-9232-964f5f867628/sniper_3d_game_download_hack_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f4b34cc-ad2e-4df6-9a1c-8aa76f545635/work_health_and_safety_management_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c18a8f19-15d0-4afe-a52a-707826bedd6e/journey_to_the_center_of_the_earth_full_movie_in_hindi_watch_online_openload.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4689a14-160e-4ec7-a105-1d659f9e4b34/86872556571.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE918 5776 bytes
SHA-256: cbadffe10ec9d0a3c5dbf3108cf4fe4147b8af1af7bc66f56e8f28c48ddcb50f
font_01_sfnt_off0000fcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC6 11144 bytes
SHA-256: 74a9279bfc0481cc3b4e834118cbd49cb059780f1fa5323d9f2c36a07c89ce84
font_02_sfnt_off000122cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CD 16168 bytes
SHA-256: e5458d7b6d82539349b17fc4713a17e1381d471255c72d9f8116b7c86e08c443