Malicious PDF — malware analysis report

Static analysis result for SHA-256 388423f4cfeae932…

MALICIOUS

PDF

81.1 KB Created: 2021-09-15 19:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4125f195754bca28d313826544232a47 SHA-1: 21a9a938c5326e63fbb556069664c8187d4da434 SHA-256: 388423f4cfeae93281d9ac1f2ed9e5041742dc660bfc5eb9ee783188abdd3863
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, presenting numerous URLs that redirect to other PDF files, likely to obscure the ultimate malicious destination and evade detection. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern of hosting many links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mlbcsimleague.com/ckfinder/userfiles/files/19012466557.pdf In PDF document text
    • http://sireny.net/share/files/45559258033.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/13670178894.pdfIn PDF document text
    • http://azizolace.cz/images/file/tufedukuzozolexafafujixo.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/70776770138.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/59207463523.pdfIn PDF document text
    • http://rc-modeller.se/images/file///18274910507.pdfIn PDF document text
    • https://trystsalonri.com/images/file/vatofujeritiwulibuxit.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/59551723539.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/fisalini.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20219141411202964.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/xagewevoxedatekisudofuf.pdfIn PDF document text
    • http://identik.hu/editor_up/fipewazuxufegalub.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/tutigutus.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/84938796256.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/fuxudejorikubinizorazak.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/9818720496.pdfIn PDF document text
    • http://pmke.cz/pictures/files/94687645486.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/nuxaje.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/notulewiliwiwupudotiz.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/sofekovejid.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/jowof.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/94157538227.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/79761434102.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/84787517206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=farming+19+download+apkPDF 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_off0000d8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A7 10712 bytes
SHA-256: aaf312c7792e073236bf33488a10d8450bed3b2d43c86a0d9013c462518777e5
font_01_sfnt_off0000f0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FF 17752 bytes
SHA-256: c1114ba1de07fa2a3c36d0293cd14edb071a0950dad3b712ad4ac7efba504218
font_02_sfnt_off00011ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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