Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf479a24f5a6f91c…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 22:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: db4a6181b646beb76ca0979fe90c199a SHA-1: 427d800c1cbeec3d716c5b0d901e601e343493eb SHA-256: bf479a24f5a6f91ca448650ee15f03fd291ed084f4a81c94d951937f0a80a084
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains numerous external links, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document likely instructs the user to install or connect with a remote support tool, a common tactic for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to trick users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://inwebjor.ru/uplcv?utm_term=ccna+service+provider+book+pdf PDF link annotation
    • http://vietdubai.com/userfiles/file/tosazetamoxas.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/29247974504.pdfIn PDF document text
    • http://linker-apps.com/files/xadelofasawuk.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210902195011.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/logopadapagu.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/71798842346.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/25364148589.pdfIn PDF document text
    • http://eko-uklid.com/files/file/fenolevepol.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/lavidoladivotovivitewisaj.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20459598785.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/bumakuzuruzowefemuvuza.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/pewomokal.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/68989098752.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/6994275862.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/17832488507.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/rogetunojomilizizo.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/lukusiwuvexuko.pdfIn PDF document text
    • https://designclarf.it/file/27021903912.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/tiwuka.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614214cfb471c---66737550796.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f484520a7d---37559992502.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/fekapisew.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_off0000d4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DA 18320 bytes
SHA-256: 346e080ffd5be181b424751214f5a594f76e2ccb5dd66dac919f46431f021fda
font_01_sfnt_off000103aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AA 10796 bytes
SHA-256: 17b207df3fcc5798703744690b67dac63e44b267a9d3e3241173f001da440e05
font_02_sfnt_off00011c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1