Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3c42db4dfb00d1…

MALICIOUS

PDF

84.7 KB Created: 2021-03-25 16:50:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ddb032f408b52ad01ab315f74b7012c1 SHA-1: 2d4333f68590e94ba34142cfca40f42d8cf0a333 SHA-256: 8c3c42db4dfb00d11a5bdbfe1995a647822571d7e6119bb1b3a97cc77bc6ebf9
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and a machine learning classifier. It functions as a link farm, containing numerous external URLs, with one notable URL being https://ponafet.ru/wix?keyword=the+left+hand+of+darkness+summary+shmoop. The heuristic PDF_SEO_LINK_FARM indicates a large number of links, suggesting a potential SEO manipulation or phishing scheme. No scripts were extracted, but the presence of many external links points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/wix?keyword=the+left+hand+of+darkness+summary+shmoop PDF link annotation
    • https://cdn.sqhk.co/dugelabomaw/ehnhggc/37084055314.pdfIn PDF document text
    • https://cdn.sqhk.co/sirojenu/Dthfjhq/vuzesipuvu.pdfIn PDF document text
    • http://geparup.scienceontheweb.net/art_models_free.pdfIn PDF document text
    • https://cdn.sqhk.co/wejafivelij/bnZggif/msi_afterburner_beta_changelog.pdfIn PDF document text
    • https://cdn.sqhk.co/fosasukenum/4jyjjfm/babies_their_wonderful_world.pdfIn PDF document text
    • https://cdn.sqhk.co/wepevuwu/gGjbjg5/hades_star_artifact_bonus.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/u9ibTLz/57494795264.pdfIn PDF document text
    • https://cdn.sqhk.co/winogolelog/2hhk3FL/93562036498.pdfIn PDF document text
    • https://cdn.sqhk.co/fitamorigob/gWgd1rZ/17881712414.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/Tjdgc3o/the_chosen_app_for_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/dijabidasu/iRiijaF/vuvuzifizululetewezul.pdfIn PDF document text
    • https://cdn.sqhk.co/rekutadis/FighgUL/bbq_chicken_near_me_korean.pdfIn PDF document text
    • https://cdn.sqhk.co/nurijodefa/ihiajgo/12598300908.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/cabaf3c8-b839-4e45-a90b-097c07a8ab3a/how_to_view_powerpoint_notes_while_presenting_in_teams.pdfIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_6d80f1ecbaab428aa9cc42112ac26e65.pdf?index=trueIn PDF document text
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_80c6545301eb4398b9e36705deb7e522.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3035a3db-7f72-44f6-bf2e-965e5e532447/can_hiit_build_muscle.pdfIn PDF document text
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_21be5958a9da4398b6f769a8fa433b7a.pdf?index=trueIn PDF document text
    • http://tudixuzaw.onlinewebshop.net/fahrenheit_451_part_1_summary.pdfIn PDF document text
    • https://47ab6ce1-aee6-4086-a8e7-31fe393d2411.filesusr.com/ugd/afbef4_1f22f44257464e83aa0d93d425a30fd1.pdf?index=trueIn PDF document text
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_814762049e734c328f03fb27ac796f99.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD0 5228 bytes
SHA-256: 61b484a5b961cc8d219ae03b2ce6761044374c015a058ab66cd5c806cafad4d6
font_01_sfnt_off0001116e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116E 10936 bytes
SHA-256: effdbdcbc57b437b77c5f8d04dfcca0999f8cab4a659d2d8a877d57c8e4efde5
font_02_sfnt_off00013686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13686 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176