Malicious PDF — malware analysis report

Static analysis result for SHA-256 58b1505428d8058e…

MALICIOUS

PDF

105.7 KB Created: 2021-03-02 02:34:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 178c0690033384953e05a88be268220d SHA-1: 2416c35c3c1ad44d9b3378fd173b33c1715d222b SHA-256: 58b1505428d8058e28ab93afc277c9604e1d9edc74259eba901578ea351e9a35
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, 'baarspo.ru', which is likely used to host a malicious payload or phishing page. The document body, though heavily obfuscated, appears to contain text related to 'Alla prima definition' and application metadata, suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://baarspo.ru/strik?utm_term=alla+prima+definition PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393499/normal_5fce4ef1cbce9.pdfIn PDF document text
    • http://vazawujuzu.sportsontheweb.net/boss_fs-5u_fs-6_fs-7.pdfIn PDF document text
    • http://zatoboyvibor.fun/ponupaboloxoriygazt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408851/normal_60393d3ed00a6.pdfIn PDF document text
    • http://midikakuvekume.mywebcommunity.org/what_are_the_four_types_of_motherboards.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377674/normal_5ff8a0cc34eff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jobavo/84266152745.pdfIn PDF document text
    • http://jowosos.myartsonline.com/47559286072.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/8389346136.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/how_to_open_sentry_1170.pdfIn PDF document text
    • http://wilanutoroguzif.rf.gd/20035184719.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/81435725542.pdfIn PDF document text
    • http://xezigogologivam.rf.gd/smadav_antivirus_for_pc_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/days_of_the_week_joined_handwriting_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/lotikaterutulanutawimo.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/xudapevup.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_off000162a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162A5 4996 bytes
SHA-256: a83ec01b44d76f9f567679d2cbefbaf5142698f53d2fa81a6253ab02a09fe3c9
font_01_sfnt_off00017391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17391 12060 bytes
SHA-256: f659c057176b8cc7e7b8b0b3b07a90b1d7b83e603d812e69dc7e986141542739

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