Malicious PDF — malware analysis report

Static analysis result for SHA-256 73989ebe08cf2246…

MALICIOUS

PDF

74.7 KB Created: 2021-10-03 08:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a358ee935751a8ca6a524373e74229a8 SHA-1: baa6636a1c1e45a471eafdf8f3dab98db96300c3 SHA-256: 73989ebe08cf22466ee864a5bd2925b5297532882441e68d63df17b1d8244706
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, suggesting a phishing or SEO manipulation scheme. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://fthyhs.com/resource/docContentImg/file/2021-09-12/4d0e18b23f545ef98e5a235751629a77.pdf In PDF document text
    • https://rwd.webseo.tw/upload/files/91390538637.pdfIn PDF document text
    • http://knipia.com/userfiles/file/21661835759.pdfIn PDF document text
    • https://raljob.com/userfiles/file/37186658323.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/noniguf.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/disedoponur.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/82623178699.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/romupetagutodominezudabi.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/daxitu.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/geberadijupinujaw.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/47181007070.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/niziwesagaxozuxabidewebe.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/68485470125.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/zaroxisipujazabasaxu.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/93557207376.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/56965146815.pdfIn PDF document text
    • https://fasaac.org/temp/files/39925528768.pdfIn PDF document text
    • http://fajni3333.fun4two.pl/uploads/assets/file/88346485079.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614c4a8d49623---lediruxeriloxujudapa.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/60769423665.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/pekuzo.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/44843531824.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/83297142408.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/56974050951.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=52+christian+basic+bible+lessons+outlinesPDF 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://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_off0000bc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC63 10724 bytes
SHA-256: e635f21cafa7c423bd0a16fc603b9f2c8b31d0a98ad91cb538430de57f3ab135
font_01_sfnt_off0000d507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD507 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED19 18720 bytes
SHA-256: 52b9daa6d2284b17f746cc83047ae2e069f3edd86a7ef013e896fe2457fc35a3

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