Malicious PDF — malware analysis report

Static analysis result for SHA-256 d052fb00f404d6f0…

MALICIOUS

PDF

88.5 KB Created: 2021-09-23 18:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 43910d9b999c6f667b0c581ef7edef69 SHA-1: ffe94cc564ccc4724353f65e464f89a2493fa0f5 SHA-256: d052fb00f404d6f085ac75de537d15e841b7f149d372965c1d41e32afdf9c0a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the document's primary purpose is to redirect users to a network of sites, potentially for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://coaching-jk-academic.com/ckfinder/userfiles/files/95199595995.pdf In PDF document text
    • http://harc-ias.vn/Images_upload/files/juluwuguxaro.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/wusazejoduwa.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/zodejobibubowinosakegoven.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/tavuriwubelofasiwitili.pdfIn PDF document text
    • https://gilbertems.com/videos/file/622894745.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/lusowiwip.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/20190293654.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/tofawevonapuxarop.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/70012415289.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/12078652179.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/nasirajal.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/titoruredifuzeju.pdfIn PDF document text
    • http://findacommodity.com/upload/file/bineliforer.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/rodixitenalukedowativ.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/lizonijevuwuzekuz.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/36663086955.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/xijikugimabedetebagusasu.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/43547998990.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109120616591597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=root+note+of+g+chordPDF 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_off0000f262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF262 19552 bytes
SHA-256: 07bb919d3b8641b08e4bf300aa00d66d10d0e9a6fbad50f33edf20b4c0eb595c
font_01_sfnt_off0001255b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255B 10332 bytes
SHA-256: 32791db31d1f3485b37ceef1b94becec860dcd472907afd548b6e06e8805fc58
font_02_sfnt_off00013c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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