Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e8bd9b74da7b795…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 13:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0322ee6d57b69f9413a9360fb3c0b942 SHA-1: ef8a086d1c3d367408fe4e1ff8fbffb596839ca0 SHA-256: 9e8bd9b74da7b795c94714f7469f34321c22a138dae2fab41842608bd368c81e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. The document body is heavily obfuscated, but the presence of numerous external URLs, many pointing to potentially disposable domains, suggests a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://digireg.dk/upload/dukupusebibefamurejej.pdf In PDF document text
    • https://kaptenhoki.net/contents/files/76379988795.pdfIn PDF document text
    • http://rsst77.ru/upload/files/26844586003.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/60797094796.pdfIn PDF document text
    • http://bscartridge.com/pic/93943367962.pdfIn PDF document text
    • http://atomleasing.ru/media/File/jumowugabojaruwaj.pdfIn PDF document text
    • http://ukrfirework.com/images/file/41176672134.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/41667636066.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/watugilisusu.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/78273387060.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/kapilolepadababa.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/jibamimomu.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/xusipebono.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/vugovunoretijipeb.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/kubexur.pdfIn PDF document text
    • http://shahgrp.com/uploads/lobasixexarumule.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/73461257143.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/xagexod.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/poworewomapudebuwusuwowi.pdfIn PDF document text
    • http://odumakus.com/uploads/files/84528902618.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/moxajavadinewekovadiki.pdfIn PDF document text
    • http://coachhouse.info/assets/file/28668836397.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/tizegavuxedirodigafisifix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=cara+logout+email+di+androidPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/kelajugux.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_off0000aeae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEAE 10552 bytes
SHA-256: ae361fd2ded41c76d73b167360cc35a2027f4fba08070161977cba0cb11bdccb
font_01_sfnt_off0000c681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC681 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE93 15684 bytes
SHA-256: 7aaff773d29eef4da706497fa945cc97ba325440203b14cc6051aefa8f41b3a1

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