Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7130cc52f96b465…

MALICIOUS

PDF

76.7 KB Created: 2021-09-22 09:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7a82a2a6aa8091a9d28b9e29cd910a11 SHA-1: b3a4354c4adca0170ccad49457140bbacbb4a27f SHA-256: b7130cc52f96b465fe78759ce13650eabd79a5ce0e48d9a95da381260fcc077c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or link-farming operation. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a large number of links on disposable hosting, further supporting a malicious intent to redirect users. No scripts were extracted, but the presence of external URIs and the overall detection suggest a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pixomot.ru/uplcv?utm_term=facebook+mp3+music+downloader PDF link annotation
    • https://hnhaa.com/userfiles/tnejp/files/bupelapawajokesukulej.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/vapufuzuvu.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/joxitewerozujazabumijej.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/81090449775.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161491079c4229---76036174161.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/jabobixut.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/rorapi.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/82863336791.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/18535065540.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/xudimunikukixikuxanital.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/3530987991.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/rugigunurekufefunom.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/fajiludower.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/426536249.pdfIn PDF document text
    • http://hotechike.com/files/files/92197336331.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/56599739868.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/nupejuliborajisifopusa.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/87021848131.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/23528280085.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/fiferevaxalesoduzeze.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/zemavoponitodabe.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/24960967661.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_off0000c124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC124 19220 bytes
SHA-256: 934d7dc9bfcce7b46bc8e57e735056ed90a93f53d3b217357fb40c8e7d59ec53
font_01_sfnt_off0000f380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF380 11144 bytes
SHA-256: 099031a97972a6d42ed9868ea29bc0336b950cd73c0406676fa61a4730aa04a9
font_02_sfnt_off00010d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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