Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc15b233fb69432…

MALICIOUS

PDF

84.2 KB Created: 2021-09-12 00:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 49732eac4be7b41489edad17a2bfa277 SHA-1: 960497b7838c1a2dd593b23d5d7fe0bd611a73e1 SHA-256: 7bc15b233fb69432ecb4ef632b1f2c148c859681f638de76206da5413017a92f
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://synerhu.ru/uplcv?utm_term=hack+wifi+admin+password PDF link annotation
    • http://klusjesindex.nl/images/uploads/47638014082.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/diliwixoberewedaxazode.pdfIn PDF document text
    • https://subded.org/userfiles/file/7627156675.pdfIn PDF document text
    • https://felicityokolo.com/file/rojidatemuvupemabukovovot.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/tovisipunafowataviluzisur.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/kenawedonorulew.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/35db31fb73a55c8ed45fe368ac34eb64/31189458095.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/wovofererujomijawebebo.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/medemelinini.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388793a8eb7---92310565468.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/nulunimugevopaju.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/52736415419.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/totifaritinugawen.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/valoxotuxubeganilaxi.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/sugojalogagogabuferij.pdfIn PDF document text
    • http://myslizdrave.com/soubory/rukujoju.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/42899956586.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/fogebutegagebasumunutejos.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/33843356674.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/82181892065.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/gidumafinuxuje.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/46230570275.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
stream_004_off0000fc6a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFC6A 18120 bytes
SHA-256: f341fdb83c4c7e25f05c091b91b612b78c36196dbc372a61949ea19585be805c
font_00_sfnt_off0000e3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F4 10676 bytes
SHA-256: 0022cd1310599a21e27dda37270806a572487d60123d0b2d04e02772b352f4d8
font_02_sfnt_off00012b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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