Malicious PDF — malware analysis report

Static analysis result for SHA-256 af93c6ca3130ae9b…

MALICIOUS

PDF

79.3 KB Created: 2021-09-15 01:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 317a15a99341715404af7d2e48c51e8c SHA-1: 1202d9b9c65cdc8234258cf14469b2a2ad0c7651 SHA-256: af93c6ca3130ae9bffb601a9057036c98ed02e3eaa1d6f490a7ddcbed22889ac
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are identified as a link farm on disposable hosting, suggesting a distribution or phishing campaign. The presence of a 'Password-protected archive handoff' heuristic indicates the document likely instructs the user to open a password-protected file, a common tactic to bypass gateway security. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=gta+200mb+apk PDF link annotation
    • http://s8radziejowice-paszkow.pl/userfiles/file/wemosisuxiditokanokolukex.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/popozakube.pdfIn PDF document text
    • http://tavio.su/files/file/javotukajusofasisolok.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/20684313411.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/94574259569.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/juvipalogufigadelexone.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/sovurusakegokebe.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/taruwove.pdfIn PDF document text
    • http://4bx.pl/public/file/38174549850.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/15511262198.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/xaluwixafazimi.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/58460095750.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210909050520.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161381ed173be2---47366041920.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/zabef.pdfIn PDF document text
    • http://glassick.com/userfiles/file/lavogetipago.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/15386034170.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/10613117723.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/63180222658.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/zawebewubigupem.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/xivebugirosiruxufete.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/3423279760.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/nipanakekogup.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_off0000cde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE3 10164 bytes
SHA-256: 0b62c7f80c157f947b0250e7149f80be42b092d79932439575d4ec56bfba75a7
font_01_sfnt_off0000e47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47B 19940 bytes
SHA-256: ddab40337c6fa8f3c28bea46e1d7252b2efe562718372511cb02ed1f4e9e8e19
font_02_sfnt_off00011820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11820 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1