Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ce51808b5859ab…

MALICIOUS

PDF

74.4 KB Created: 2021-09-21 16:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 529bb89f8062ac68c9b73477525282b4 SHA-1: afef55e18d7b36a24e57a15ce550ab48d792ce03 SHA-256: b1ce51808b5859ab4b2de5d3d50ed038386b8b3eb2c0b0237234238ec537c168
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one with a 'utm_term' parameter suggesting tracking, points towards a phishing or malware distribution scheme. The heuristic 'SE_URGENCY_LURE' further supports the phishing pretext, indicating the document likely contains language designed to prompt immediate action.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://wastran.ru/uplcv?utm_term=cinema+hd+premium+apk PDF link annotation
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/fidumutototinanu.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/bilix.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/pugogibivajedunukutabotit.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16147edd6001d7---52732865227.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/rupif.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/perisuvukipadexinatezesit.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/lekoxatotelamenaxokugazu.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/16811487163.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/basetapod.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/lulozuzudij.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/172038276735.pdfIn PDF document text
    • http://banquat.com/userfiles/files/woxidexosod.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/40789589665.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/gomaxevudilunelexanipama.pdfIn PDF document text
    • http://forti.in/userfiles/file/pudajikudisonazesuxoxom.pdfIn PDF document text
    • https://suksesunited.com/contents/files/80501667480.pdfIn PDF document text
    • https://rjpexport.com/files/73166232556.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/tenixem.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/mjed95nt1oooqdm94i9256pm52/52499980554.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/kurutaluledu.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/zosab.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/11457166478.pdfIn PDF document text
    • https://equalland.com/uploads/File/potikis.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDFF 10448 bytes
SHA-256: a3e224db0153d0a564f00e312933414fd8369c748debb4c2352d238de8ed29ca
font_01_sfnt_off0000d566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD566 17968 bytes
SHA-256: 201d7cfe8e2c1a995da10b62331bfb46718b7cfe52d201a91999b0c3b4b28b51
font_02_sfnt_off000103f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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