Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5667dedbe9dceed…

MALICIOUS

PDF

79.0 KB Created: 2021-09-18 06:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5babcf0d8269b314dfd39a9b7d739b12 SHA-1: aaecb895aba8df1d5dca089a736f2fcf3a0dc68c SHA-256: e5667dedbe9dceeda7ff8f16adcc08a1ce0265aeb3a4ede543371779d3d73c94
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users. The presence of numerous external URIs, many pointing to PDF files on disposable hosting, indicates a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ues-rb.ru/themes/ues-rb.ru/files/54111117789.pdf In PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/418123258.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/ludalupovigepovolapidom.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161366c99792ce---84151012237.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210917083117.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/55727044494.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/19060662521.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/kilejokugidobezukisarit.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/jirabilil.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/vizuba.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/gekegujibeloduwuvas.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/86920636923.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b2c69f87e---wokikasunagafakelu.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/jetevorediwi.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/jefejizer.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/74890325967.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3d79309ad---vufanesus.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/xolamedolagupiporakobuv.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/benolijezijesij.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/wesikulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=apa+porn+apkPDF link annotation
    • 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://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_off0000dc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6A 9780 bytes
SHA-256: cc37131c3c7682d52165ad58db87bfdec62f74702e5868ae2abb6546226585d6
font_01_sfnt_off0000f1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E9 16584 bytes
SHA-256: bd6e4917181dd0b088d8e999031614ec37b76f0ff7009d752de6bd189fcadeba
font_02_sfnt_off00011c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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