Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7254eeb2b8c01c2…

MALICIOUS

PDF

88.1 KB Created: 2021-05-26 07:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0869ea3729a4df3a895a1cdc17b65a46 SHA-1: 74f4fbb75492dcd8180e0fb58d2c724c0b2ad3a5 SHA-256: f7254eeb2b8c01c2474b924bcb1ca096a80313ce99821a47dfa7f6ad4d708eb5
156 Risk Score

Malware Insights

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

The PDF document contains a heuristic firing for a link farm, indicating it is designed to direct users to numerous external URLs. One of these URLs, https://kuzutuzo.ru/strik?utm_term=hogwarts+extreme+sorting+quiz+answers, is presented as a lure for a Hogwarts quiz. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via the linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=hogwarts+extreme+sorting+quiz+answers
    • https://gegizadewer.weebly.com/uploads/1/3/1/4/131482997/4646847.pdf
    • https://zaruneza.weebly.com/uploads/1/3/2/8/132814400/7a2ab.pdf
    • https://fazotevepokok.weebly.com/uploads/1/3/4/8/134865813/xunopifu.pdf
    • https://jixikasipad.weebly.com/uploads/1/3/4/5/134596843/kasufaxet.pdf
    • https://febumade.weebly.com/uploads/1/3/4/7/134757335/685777.pdf
    • https://gixujadimi.weebly.com/uploads/1/3/4/7/134708567/9615190.pdf
    • https://vudunige.weebly.com/uploads/1/3/5/9/135981242/sikizuw-jedadi-lonosalojupuj.pdf
    • https://xuropowupenuba.weebly.com/uploads/1/3/0/8/130813979/656c8ceb0edaa4.pdf
    • https://pukaxonimuno.weebly.com/uploads/1/3/4/4/134435323/1180078.pdf
    • https://xavixikani.weebly.com/uploads/1/3/4/5/134502132/jorutanuboxifu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6177d0b9-6712-4e92-8d1b-9451d0a6ca66/logitech_mk360_vs_mk270.pdf
    • https://uploads.strikinglycdn.com/files/8df8d6a4-988e-468b-a72f-9bda07cb482c/fikaziropubuvenak.pdf
    • https://uploads.strikinglycdn.com/files/00f03e89-94e9-4fc0-9940-224fe7e63b3b/how_to_write_up_an_interview_in_apa_format.pdf
    • https://uploads.strikinglycdn.com/files/b9de37d8-ba86-4641-a581-713b6de9e0e1/what_are_some_good_warm_up_exercises_for_basketball.pdf
    • https://uploads.strikinglycdn.com/files/a77bd8a4-2f44-4ecb-aaaa-f1fe06be2a91/19672487803.pdf
    • https://s3.amazonaws.com/sixolose/befunky_free_for_windows_7.pdf
    • https://uploads.strikinglycdn.com/files/4f9bf733-9226-438c-bb53-ac5d0d64ed1a/is_vegan_or_vegetarian_better_for_weight_loss.pdf
    • https://uploads.strikinglycdn.com/files/fc89005a-799c-4049-ba98-71b55acdbc5a/vista_32fb_programming.pdf
    • https://s3.amazonaws.com/lixuzo/aida64_extreme_edition_portable.pdf
    • https://s3.amazonaws.com/domegagowevag/winrar_windows_10_english.pdf
    • https://s3.amazonaws.com/mijumomub/36939202283.pdf
    • https://s3.amazonaws.com/lemefofutomapox/pivulevofekitow.pdf
    • https://uploads.strikinglycdn.com/files/d1a432bf-dbac-46d3-9cc8-13338b4b6edc/vivuniwuxi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011cd2.bin
c172fb1d8a89823f5954b83707da588a2ac99bc8d2812b9f4cc81b2da94bf76a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD2 5268 bytes
font_01_sfnt_off00012ec8.bin
d4b13b30925003fe40e6cc19e5bbcc3fa8a70ed99be38bc395e5b9538e3e1425
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC8 10544 bytes