Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ff6b0b0d891847…

MALICIOUS

PDF

94.8 KB Created: 2021-02-13 10:06:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 885351bf068b9ef5ed1f42ff2be4863b SHA-1: c0428b7db64879b07437473592548a0a8cfba13d SHA-256: 55ff6b0b0d8918479c0afe2468dea7341cfaf0f8eacbbab56838e72b51341a25
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier also flag this file as malicious, specifically as a phishing trojan. The embedded URLs, such as 'https://maypoin.ru/aws?utm_term=dbz+abridged+android+16+speech' and 'http://kraftmann.su/104564622657h7fz.pdf', are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://maypoin.ru/aws?utm_term=dbz+abridged+android+16+speech PDF link annotation
    • http://kraftmann.su/104564622657h7fz.pdfIn PDF document text
    • http://topfrag.rip/xulegogazurusurosalubodub411j9.pdfIn PDF document text
    • http://winoorama.space/street_fighter_2_turbo_cheatsowvz6.pdfIn PDF document text
    • http://workshop-fb.ru/edpt_study_guide8gtr1.pdfIn PDF document text
    • http://air-calm2.club/lamuwabifazibid5y7x0.pdfIn PDF document text
    • http://klokisik.space/nivokoguscydo.pdfIn PDF document text
    • http://goodsun.fun/word_stacks_level_139i83b3.pdfIn PDF document text
    • http://dmdmassage.com/lic_policy_cancellation_letter_format6rtqi.pdfIn PDF document text
    • https://fobanuvoba.weebly.com/uploads/1/3/1/6/131637247/496876.pdfIn PDF document text
    • https://xazonidunigi.weebly.com/uploads/1/3/4/5/134590253/sawigejoxuxiw.pdfIn PDF document text
    • http://jopkapopka.online/cheap_lemon_candy_slices_quicklymrt4o.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://s3.amazonaws.com/wofaxil/accidentally_in_love_guitar_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/2626752538.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/arduino_joystick_shield_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/ruzokejijosotizironajator.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/fetal_development_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/party_cha_cha_charey_song.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/cheju_halla_university_application_form.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA7 3020 bytes
SHA-256: 4697477dab41844e2c8f9f1d0425d5ca5c4d618e6fac80cac7e16dfa40168302
font_01_sfnt_off0001286c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286C 5404 bytes
SHA-256: 225cdad8a681ed547f41769072cbe4d58d357bdf96d1c07ef8024b269ad99b29
font_02_sfnt_off00013abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABB 10656 bytes
SHA-256: 265a2a68f1bb2bd07540d5a29eefdb56bb11cdafc4108853bd16c34277ece6ce
font_03_sfnt_off00015f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F31 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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