Malicious PDF — malware analysis report

Static analysis result for SHA-256 441e4239d20916eb…

MALICIOUS

PDF

87.8 KB Created: 2021-09-11 06:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e5db4aa37345f63964d82a4c9ab777c9 SHA-1: 44dd747aecedc8388a73be94268c95954b860a95 SHA-256: 441e4239d20916eb67978d6dce3c4764aaad281a63291fcf12e5630c2aee2111
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Several embedded URLs point to potentially malicious PDF files, suggesting a distribution or phishing campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true malicious intent through a large number of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://bawauang.com/contents/files/loxaladoki.pdf In PDF document text
    • http://penzion-u-zamku.cz/files/file/janajag.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/toguravuliwuvubabosaxode.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/fewosisarurelu.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/pawuwilaxozexarobad.pdfIn PDF document text
    • https://begili.com/uploads/image/files/876630666.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/gogetabopafosutopob.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/xawevogubalav.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134b71a6b07f---renodetopokupesopasilogil.pdfIn PDF document text
    • https://mkontakt.com/dat/file/pawasuxemuxewaruditikutu.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161336e9e53172---29978529701.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/8336962122.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/66306803778.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/vazab.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/jemudaxe.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210909225848.pdfIn PDF document text
    • http://mlead.net/images/e/file/26584766696.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/ratib.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/riluf.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/kababibof.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/getarewagisoraji.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/25115744491.pdfIn PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/muminilajepasoni.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/80315025181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=party+animals+game+apk+downloadPDF 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_off0000f276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF276 11028 bytes
SHA-256: a176b81cb06e8514293e049ee3d6d08eda2bc00bafd6ec76071136a5f30f56c0
font_01_sfnt_off00010bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF4 17624 bytes
SHA-256: 3e539eb5dfbf28ff7c3e94f6e93942793da86f8c4b47fb2eb9edd998d885ff67
font_02_sfnt_off000139d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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