Malicious PDF — malware analysis report

Static analysis result for SHA-256 4563bcb7e7277025…

MALICIOUS

PDF

76.7 KB Created: 2021-05-16 14:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f9d529ba7d8ccc5796434b9f4bc03b2 SHA-1: 733e1b1ef00aa16bc2a5dce3b23882bf5319433f SHA-256: 4563bcb7e72770251bf496901ffe0e12b70aab0ee6a7fc969af104f61cf8e4fa
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. The primary malicious URLs identified are 'https://kuzutuzo.ru/strik?utm_term=why+is+appearance+important+in+an+interview' and 'http://axacheat4.xyz/what_africa_was_called_before68it4.pdf'. ClamAV detection further confirms its malicious nature, classifying it as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0'. The document body, though heavily obfuscated, suggests a lure related to interview appearance, likely a pretext to drive clicks to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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=why+is+appearance+important+in+an+interview
    • http://axacheat4.xyz/what_africa_was_called_before68it4.pdf
    • https://lonopenofof.weebly.com/uploads/1/3/4/8/134895818/5420017.pdf
    • http://mercelus.xyz/kodifivof4hht.pdf
    • https://dotijude.weebly.com/uploads/1/3/0/7/130740148/79840ed701.pdf
    • http://rufajefas.22web.org/crioterapia_equinos.pdf
    • http://dompodklyuch.com/kefezapoxedazikigatuxo8jyw6.pdf
    • https://kukiramofup.weebly.com/uploads/1/3/1/4/131413837/7354863.pdf
    • http://xitelisefevo.22web.org/system_analyst_roles_and_responsibilities.pdf
    • https://gemunokixelu.weebly.com/uploads/1/3/6/0/136095878/5feb326b5d.pdf
    • https://wokiliga.weebly.com/uploads/1/3/0/8/130814475/serere.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/besafefaf/angry_birds_rio_game_apkpure.pdf
    • http://sapimidogiraja.rf.gd/34538325683.pdf
    • https://s3.amazonaws.com/sivanira/chick_fil_a_sauce_nutrition_information.pdf
    • https://s3.amazonaws.com/vobuturinivi/brand_guidelines_indesign_template.pdf
    • http://xujekapowizi.epizy.com/33490566076.pdf
    • http://deweleve.epizy.com/how_to_clean_bionaire_humidifier_fan.pdf
    • https://s3.amazonaws.com/dorobukasawituw/kohls_bella_waffle_maker_rebate_2019.pdf
    • https://s3.amazonaws.com/jixeremipet/zojirushi_rice_cooker_problems.pdf
    • https://s3.amazonaws.com/niwotipugonuvoz/room_on_the_broom_book_cover_image.pdf
    • https://s3.amazonaws.com/nowokil/88541089318.pdf
    • https://s3.amazonaws.com/lezerawe/genadaxipokadexetemuvev.pdf
    • http://wexugemo.epizy.com/27240009063.pdf
    • http://sulegezusaz.epizy.com/4d_god_wallpaper.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_off0000eca5.bin
e4b6154a5fa376512085fc69eba03f243dd44daf5859c041f203e71db17065df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECA5 5408 bytes
font_01_sfnt_off0000fefc.bin
81c54be3741cc56f88aa7eb21479e9f26083c5ea411a885c64498d439398075c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFC 11148 bytes

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