Malicious PDF — malware analysis report

Static analysis result for SHA-256 a68ca0575c626f6f…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 08:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3b597b88d32969c3b69d4805eba6504 SHA-1: ec0b3dd3b3088592adf3b2e59ee3f1450f440f89 SHA-256: a68ca0575c626f6ff29d1a44a8ac6bc5578a468147418048ec31057774b9f42c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, suggesting an attempt to direct users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure.

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://philabc.ru/uplcv?utm_term=blocksite+apk+download
    • http://mlsconsulting.net/cms/files/File/3430153155.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/xulusotego.pdf
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/87449832351.pdf
    • http://artdealer.vn/upload/fckimagesfile/a9c192d5621a0c43acda1be0cdd1149f.pdf
    • http://contelex.it/userfiles/files/42702199880.pdf
    • http://koddous.com/userfiles/file/59272052707.pdf
    • http://huichem.com/ckfinder/userfiles/files/19062074103.pdf
    • http://autosvilar.com/uploads/ckfinder/files/43037781764.pdf
    • https://qfse.co/images/uploaded_files/ckfinder/files/1631053380_f9766b768a.pdf
    • https://next-engineering.com/userfiles/files/zuniwuxuvirag.pdf
    • http://sireny.net/share/files/vomanamodava.pdf
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/446501497.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/dfd0272c24c913978b66cb4e20ed4270/37540598354.pdf
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/84291127957.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf3e7e6158---89608559707.pdf
    • http://vecsecity.info/editor_up/77793194479.pdf
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/39111691198.pdf
    • http://tobn56.com/UpFiles/file/lomodisugibibewadaju.pdf
    • http://skncn.com/u/files/zumavipikoxuzozeromu.pdf
    • http://fittbikese.hu/files/file/fewin.pdf
    • http://lnv-cnc.gr/userfiles/file/66322257975.pdf
    • http://myepres.com/HotelEstimator/userfiles/file/50864883619.pdf
    • https://suma.ca/upload/editor/file/kibonubajakipetinulofa.pdf
    • http://razzledazzleevents.in/userfiles/file/jegep.pdf
    • http://ever0036.com/assets/uploads/ckedit/files/20210904005559.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de15.bin
4fcf664bbcb184cf1d930ed952bf1b2e94d170b09453893d10f554cbc8f9acea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE15 18632 bytes
font_01_sfnt_off00010ee0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE0 16792 bytes
font_02_sfnt_off000126f7.bin
06e499f8f01cb9f818a0121cbbe9d95ee6d4852e04e6c85464dcdc5bb5bffb9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126F7 10640 bytes

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