Malicious PDF — malware analysis report

Static analysis result for SHA-256 4876da2295ba8a78…

MALICIOUS

PDF

76.5 KB Created: 2021-09-15 13:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f0e3e092705dd3ddc56f169fd4b0deb1 SHA-1: a9c2146fe70ec59cb50d4e5107c9672df848438f SHA-256: 4876da2295ba8a78f4412fa6961d31dc08cffa4cc0cb33bf73af08109d89deb7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable hosting, a common tactic for phishing and malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a malicious intent to obscure the true destination. ClamAV detection and ML classification confirm the malicious nature of the file, likely serving as a lure for unwanted software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://drafthe.ru/uplcv?utm_term=download+ccleaner+mod+apk PDF link annotation
    • https://jv-cms.crazy-jessie.nl/uploads/files/93588541033.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/dafogepapijose.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/vlpd1d9fgf9m4mpar94qs1g0tp/34328433691.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/31304826138.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/xufavebotaretenated.pdfIn PDF document text
    • http://www.polni.si/Images/files/17174672539.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/82304617222.pdfIn PDF document text
    • http://airzo.net/userData/board/file/84744485157.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/vunalane.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/joduvaramagikojezaxejopo.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/navofeg.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/balabipalow.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/74151529510.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/futerupojutokijejolanili.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/56732531917.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/53723065575.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/17892753165.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/75564947741.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/94628399416.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/39513687916.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/58015816350.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/gebuwafoki.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373822129f3---22117505576.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_off0000c5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A6 17992 bytes
SHA-256: d6cadaea81f637a373e66ef246a255f16ba26afef19879c421fad85877146418
font_01_sfnt_off0000f4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AD 10496 bytes
SHA-256: 2603b1c7a224a525b4ec5d7dff46258b53da4d0169a6432af7fa9ec3396d4530
font_02_sfnt_off00010c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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