Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c9b3da3b97dd72…

MALICIOUS

PDF

75.9 KB Created: 2021-03-16 06:11:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: df971800a2a1f761b6226e8a58881bb3 SHA-1: db0a8066a65dadb8bd0fde770265bf93408931c2 SHA-256: c7c9b3da3b97dd72889915326cc9b4bb89f531e45d65d29e16b4ff00263be7e0
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links, many hosted on disposable domains, suggesting an SEO spam or phishing campaign. The primary URL observed is https://mezovuduw.ru/wix?keyword=jackie+robinson+questions+and+answers, which is likely used to redirect users to malicious content.

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://mezovuduw.ru/wix?keyword=jackie+robinson+questions+and+answers PDF link annotation
    • https://nizevamil.weebly.com/uploads/1/3/2/8/132814567/9165575.pdfIn PDF document text
    • https://kexanitafax.weebly.com/uploads/1/3/0/8/130813084/fotupotisoful_sogekijotubumo_rexikesodijo_defela.pdfIn PDF document text
    • https://cdn.sqhk.co/nanagajog/CghijcM/vakitanugez.pdfIn PDF document text
    • https://zibezalobe.weebly.com/uploads/1/3/4/5/134529300/wugujadipe.pdfIn PDF document text
    • https://cdn.sqhk.co/wegodimumod/Kzjbgjd/the_voice_assistant_coaches_2019_season_17.pdfIn PDF document text
    • https://pizubaxoke.weebly.com/uploads/1/3/4/4/134496652/napozofel.pdfIn PDF document text
    • https://rakiletapaleta.weebly.com/uploads/1/3/1/8/131856645/5ac9d09.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/iqdKMjh/f_sim_space_shuttle_mod_apk_android_1.pdfIn PDF document text
    • http://pakawuwujawo.getenjoyment.net/rumowivifegilatapegorose.pdfIn PDF document text
    • https://jimatekazame.weebly.com/uploads/1/3/4/6/134669874/fuxewupakataw.pdfIn PDF document text
    • http://jenerotisa.mywebcommunity.org/1132383557.pdfIn PDF document text
    • https://repawuwo.weebly.com/uploads/1/3/5/3/135313919/modulumasupamu.pdfIn PDF document text
    • https://cdn.sqhk.co/perajomipe/ZhhPZJ0/ninja_fighting_fingerstyle.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_45c8f2a44c9f4a58a7716e1bfd0f24ae.pdf?index=trueIn PDF document text
    • http://wokidomogu.onlinewebshop.net/dizemanufivo.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/tazalipudanozuremopor.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/how_long_to_nurse_once_milk_comes_in.pdfIn PDF document text
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_7777974d09ae488eb74cb70adea25a86.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/roware/44718324628.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/puforidikakome.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB41 5312 bytes
SHA-256: b91e38d08caa21ff451a87f67d2716a98a4aa810774bfe0ea00cb63dbaa96cf4
font_01_sfnt_off0000fd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6E 10320 bytes
SHA-256: 6c9917f40cdb5e71336e0b2fcddedb7262c2885f310467c904a2a59d806b569f

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