Malicious PDF — malware analysis report

Static analysis result for SHA-256 231c35ac5ac2b8c0…

MALICIOUS

PDF

88.3 KB Created: 2021-09-20 00:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9dc5ef29e04abb041d2d7988444c01c3 SHA-1: 9a36bd7e507de33bb50d780935ba78f254d81e77 SHA-256: 231c35ac5ac2b8c0310ae6cfae314c2b86ed334a39b788782715133c611f38b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination or distribute malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users through multiple domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oniceh.ru/uplcv?utm_term=how+to+fix+android+bootloop PDF link annotation
    • https://allmassage.net/upload/file/20210917132943.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210914_4B5E2A5644C61D05.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/kovuvaxolifiw.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/36463424271.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/nokukefezif.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/vumogidil.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1692f15db---galikematurukubuxagar.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/rumavazisobegal.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/buzip.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/35776836306.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/19519503224.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/14169443520.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/mokekosuxosofiwa.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/84865679787.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/36121554643.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/89508779338.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/pawepebapisavalenan.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/6912903204.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/14426364325.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16140f80b011b2---pelefenijalexozudorifam.pdfIn PDF document text
    • https://camelcarpet.org/d/files/nisoxafozuzafofanaxufopup.pdfIn PDF document text
    • http://ippon.lv/uploads/File/biturovololaveburofi.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/64543454358.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/32117195026.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
stream_005_off00013bb0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13BB0 10512 bytes
SHA-256: 2cdf1970e86f77716e34e752e17bc5383702836e1694030731806a21b9dca142
font_00_sfnt_off0000efae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C0 19988 bytes
SHA-256: c2c3ee64d20de92e131860b2345dfe6c0c171525bb6770ef255575effd745654

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