Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d3f0d71af74534…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 18:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a177575cfc280f9599742486c639acbd SHA-1: cfa7727f3e1a0f45a521b01045970c650b2905e7 SHA-256: 38d3f0d71af745343a8019e66685dd4934377623d434ff28d0ac1b09f75cf4cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a common tactic of redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cructi.ru/uplcv?utm_term=shadow+fight+2+apk+hack+download PDF link annotation
    • http://supermarketdv.ru/files/file/zexivuronozufigexozafu.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/lukik.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/debewojavutaweso.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/55593184660.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/setekaleduvuza.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/83652916060.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f17f03f2dd---sesojewurer.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210918045023_2036680528.pdfIn PDF document text
    • http://kd-council.com/upfile/files/51506286254.pdfIn PDF document text
    • https://themalc.org/files/file/nagitiro.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/midamijajarejidijiwewegug.pdfIn PDF document text
    • http://industrialdevices.in/uploads/rolawiwubevud.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/27428340868.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/sukawiniri.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/nokotiwopepobibemegiw.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/doreru.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/fipoxobiregirokulafo.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a067a4e7bc---59839581317.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/xenokaluxifaguboturaderep.pdfIn PDF document text
    • http://kbfrutos.sk/images/_file/29479758780.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/dosebim.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/41752186060.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/75334684645.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_off0000d3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F1 18296 bytes
SHA-256: d8645f656495dc4eb600aea8cb235527b5bea403c865fa82bfeb0e3c751003c7
font_01_sfnt_off00010355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10355 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6C 10872 bytes
SHA-256: 0305084c1bfb2c23b5704e9ef95b19354649ad669f1ec40676de441a477765e9

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