Malicious PDF — malware analysis report

Static analysis result for SHA-256 abd08a85ab65051e…

MALICIOUS

PDF

79.7 KB Created: 2021-10-09 08:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 36f90559b35a37f42863faf6dd8af555 SHA-1: ea40b6820193ef6d3aa1343e9bf37b958e394f5a SHA-256: abd08a85ab65051e1ed281bafdb64d8e5459228d58bec94ccac7e32dbd003c4f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing/trojan PDF. It contains numerous external URLs, many of which point to PDF files on disposable hosting, indicating a link farm or redirection scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document's primary purpose is to host these links. No scripts were extracted, but the presence of multiple external URLs strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 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://inwebjor.ru/uplcv?utm_term=conversion+of+cal+to+joules PDF link annotation
    • https://0a3exp.com/upfiles/editor/files/titupinofo.pdfIn PDF document text
    • http://garderoba.sk/images/_file/lifelokilok.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/70485921848.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/2v30rb2i7pmakcr2sprticlf09/fimidoribejumabetogelom.pdfIn PDF document text
    • http://com123.vn/uploads/file/29714080232.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/togene.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/47694028794.pdfIn PDF document text
    • http://cartopack.be/Images/file/76318658646.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/58278729282.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-10-2/20211002224326739764.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/fixuzuxoluturu.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/junigotawolob.pdfIn PDF document text
    • http://webursitet.org/Files/file/dobariwexiniwisadak.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210905_116A2AC4075D5BE7.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/19829046748.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/63023033953.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/silasijokirebudiniko.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/3549f21dfef5340767e27edbd20dd862/vibupijovaxuj.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/fanefatu.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/malajat.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/nofamizugo.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_off0000cfbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D0 18840 bytes
SHA-256: 882637a0d0ae2720b92dcb2bc046212c48fb18069075195be188bf327cc47116
font_02_sfnt_off00011895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11895 10656 bytes
SHA-256: 359626138ddd5095c3036b9f602c11593a5f1ebd5f661c66e792d91d3ba72e5d

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