Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d896117ab2bfd3f…

MALICIOUS

PDF

71.0 KB Created: 2021-09-30 17:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5da3abfcf7224f9f58a127398e0b5667 SHA-1: f4ba7433d680a9557b5ef39aa766fb9d9369b6cf SHA-256: 8d896117ab2bfd3f4a7318e89c92406ec0ebfc1319183e987d242cc0cb853f08
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are structured to appear as file downloads, and one URL specifically mentions 'gangstar vegas download apk' in its path, indicating a lure for game downloads. The PDF structure and embedded links suggest it is designed to redirect users to malicious sites or prompt downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148f9549474f---82925877867.pdf
    • http://faizleathergloves.com/userfiles/files/39600649821.pdf
    • https://membermimpi.com/contents/files/dogosigogevujomato.pdf
    • https://fresh-cherries.com/ckfinder/userfiles/files/wesufarabitizokezogofulu.pdf
    • https://paidionresearch.com/userfiles/files/juxenigutudokumemejuperip.pdf
    • http://silverk.ru/img/lib/file/liwebo.pdf
    • https://makojudo.pl/zdjecia/fck/file/22124940075.pdf
    • https://artistaone.co/userfiles/files/jaxojozu.pdf
    • http://urgentcarepb.net/userfiles/file/84410728609.pdf
    • https://estatecambodia.com/htdocs/cljr/data/files/worexifizomulusoxesimolo.pdf
    • https://korvioinfotech.com/ckfinder/userfiles/files/5391960305.pdf
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/domazebaju.pdf
    • http://www.andreapondika.cz/file/36411121934.pdf
    • http://malbreil.com/userfiles/file/10641061727.pdf
    • http://vnationwide.com/userfiles/files/56001252165.pdf
    • http://entryexpress.online/chapter_images/files/88268551005.pdf
    • https://mimpisiluman.com/contents/files/risoparod.pdf
    • http://detskaoptika.cz/ckfinder/userfiles/files/6160658503.pdf
    • https://www.pessin-location.fr/ckfinder/userfiles/files/2640072702.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c0482cfbe5.pdf
    • http://snieznik.pl/userfiles/file/fililajesituvibuwi.pdf
    • https://designclarf.it/file/kutoji.pdf
    • http://joesservicecenternj.com/userfiles/files/56345518656.pdf
    • http://halongbaycruises.org/upload/files/taxiniwunoragajibekaji.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=gangstar+vegas+download+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b30b.bin
d07d71b2383240347f2729751a80a0f72e7e5e3677c295807b2ec7e2e39f60d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB30B 16560 bytes
font_01_sfnt_off0000dd53.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD53 16792 bytes
font_02_sfnt_off0000f56a.bin
66ae81e36719645187e16d7f6a2d59e40315fba4425dd9440aa5bdfce96145fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xF56A 10756 bytes