Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ae99a07f909bf0…

MALICIOUS

PDF

82.7 KB Created: 2021-09-12 05:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c04d9ff1829b1d07a86148529ebb759a SHA-1: 9c0c6521df218d8c358c7db958964d4850f2fef2 SHA-256: 73ae99a07f909bf0560e9991b2000b9f2c0f79ce4bfbe6d8b0d84665d753b6f5
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely contains instructions to decrypt a password-protected archive, a common tactic to bypass gateway scanning. Numerous URLs hosted on potentially disposable domains suggest a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613d279e1a7d5---45893400351.pdf In PDF document text
    • https://rowadalbyt.com/userfiles/files/77276175940.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/winaxar.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210911060513.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/22757676518.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/69343090005.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/riratemuzazekexegal.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/fexozelopax.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/6710490377.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/17228323082.pdfIn PDF document text
    • https://orrizon.ru/images/file/29599776418.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/81549934570.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/xavedudawupokuvijof.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/19881321360.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/72410481555.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/fejavuxunigunugizimij.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/fff58a236586589443af25232b6f2ed0/33076406362.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/84604502036.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/56745162668.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/gepofelevixegixom.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/50168298683.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/43751712916.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/15259325852.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/40643773859.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=bypass+iphone+11+lock+screenPDF link annotation
    • 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_off0000dee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE2 17740 bytes
SHA-256: 948bd9c5cddf7d079542dbb8a1f04736e68294b408cf29243b5d49c6a3784fdc
font_01_sfnt_off00010c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001247e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247E 10684 bytes
SHA-256: 59832d02a9e7806b2c7e0aace75160a6bc2c615069aff4fca03429fd39457bf3