Malicious PDF — malware analysis report

Static analysis result for SHA-256 de73907131bf974a…

MALICIOUS

PDF

81.0 KB Created: 2021-09-15 09:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3c505f82440f8e1908d0549f114a2bfb SHA-1: 2098c319af0cb4fd0a2cda23e77e8c3ce4aedd89 SHA-256: de73907131bf974af9239da789688bba6ea76edeba094c88f4f0b41fbaff19db
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 numerous embedded URLs that form a link farm, directing users to various domains, one of which is a redirector designed to obscure the final destination. The primary URL suggests a lure related to downloading software, which is a common tactic for phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://laborke.ru/uplcv?utm_term=download+latest+version+of+facebook+messenger+for+android PDF link annotation
    • http://hide-bo.com/img/tmp/file/70561112684.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/83383624388.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/biwiwejotaludomijakedit.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/jojuxur.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/45609138862.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/77979306467.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/ruranowutikefalel.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/52816604593.pdfIn PDF document text
    • https://majubesar.info/contents/files/60669037040.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/wimevolorolinibeb.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/26942793630.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210910111731.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/bafiwikilemip.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/6894435954.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/kipatimitunusajud.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b08691d9e7---71123865423.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/23816532814.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/sisebutonikitexevedi.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/pagofudupaxiwebi.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/49478151643.pdfIn PDF document text
    • http://chinalabware.net/d/files/87545965501.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/jetokosixevinoxi.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
font_00_sfnt_off0000d758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD758 11204 bytes
SHA-256: e6d7e9fa67cae7291c9205abcc8682719fc41f145fa32d03e89edb34c3af7bcc
font_01_sfnt_off0000f176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF176 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10988 17276 bytes
SHA-256: 68e20657e8ecd22ff6afee8c7244b738b5425a136d3fc601b52a78616245f0ef

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