Malicious PDF — malware analysis report

Static analysis result for SHA-256 345b1d9ec3a59417…

MALICIOUS

PDF

63.4 KB Created: 2021-02-24 04:22:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a8f9ec95e072fb121194ac6bc6891903 SHA-1: f54c4a2010747cbf4b8d9dcbc79e18836ef9389e SHA-256: 345b1d9ec3a5941749394d30573c3f8b22c59f7c1290198e9a45719964890500
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains multiple external URIs, with a prominent one pointing to 'baarspo.ru', suggesting a redirection to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is part of a link farm on disposable hosting, likely for distributing malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://baarspo.ru/wix?keyword=holt+middle+school+math+course+2+answer+key+pdf PDF link annotation
    • http://keto-menu.online/xevowedositimifunutenen4wrvj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_5fd2a5deaad67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453579/normal_5feec4bd94770.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492529/normal_6005051062171.pdfIn PDF document text
    • http://toxedixekerej.22web.org/back_exercises_arc.pdfIn PDF document text
    • http://qupieasy.online/breezeblocks_piano_sheet_music3ciew.pdfIn PDF document text
    • http://winsbig.space/gitujifutulubupolikamagap3gqng.pdfIn PDF document text
    • https://sumajodezidozi.weebly.com/uploads/1/3/3/9/133997227/nepadovafazajo.pdfIn PDF document text
    • https://voloripilobolim.weebly.com/uploads/1/3/4/6/134635915/menivapapeso_sexoposomodojub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sisadeb.rf.gd/pillars_of_eternity_poradnik_chomikuj.pdfIn PDF document text
    • http://gezixerigalejeb.rf.gd/22817230557.pdfIn PDF document text
    • http://gobobanowis.epizy.com/adform_tracking_code_example.pdfIn PDF document text
    • http://janalusexisowa.epizy.com/lenow.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/85718174703.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/sumowezuwavozeletu.pdfIn PDF document text
    • http://xadeboni.epizy.com/97409177212.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/brisingr_christopher_paolini.pdfIn PDF document text
    • http://jutibigata.epizy.com/88574582992.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_off0000ba45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA45 5748 bytes
SHA-256: 68e0cd93ab4c6e366c6dc8739861fde13985b8c909f7923e1140bd52ce791c74
font_01_sfnt_off0000cdc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC0 9996 bytes
SHA-256: b4e43db45148a8679a182e2e3c7286d45f9c317644123f920eff373be99af3c8

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