Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4127ef63a1634c9…

MALICIOUS

PDF

89.0 KB Created: 2021-09-15 20:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: c9cbd9d8102dcddc8c7917352301c8ec SHA-1: 605bb6a300763de3b02135dc750f9eb84c3e44aa SHA-256: a4127ef63a1634c908ad6efd27177f9f3c118a3b0688be1dbf41ef712d448332
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, suggesting it functions as a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the sample's structure as a link farm on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://kangshi-you.com/uploads/files/202109111948031228.pdf In PDF document text
    • http://suurelepa.ee/data/file/78733487694.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/84299053224.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/tokapixabizapivig.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f691dac056---90916977839.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/3070303065.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/88838883961.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/wavapakipol.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/65199764569.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/xapofijozata.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/luvebixesivaxufidokor.pdfIn PDF document text
    • http://jonme.net/ckupload/files/wezepegofev.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/tozefuwagefe.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/19256870840.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/fazezadofikasaboz.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/15715880373.pdfIn PDF document text
    • http://vaithun.net/upload/files/23332133777.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/sojinelebikek.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/17316836555.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/vepetajesapugowebupos.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/80968347793.pdfIn PDF document text
    • https://digireg.cz/upload/berofupusukavutexa.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/65419676336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+skin+i+live+in+watch+full+moviePDF 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_off0000f82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82C 10808 bytes
SHA-256: 7167e11267134dfa818de189b9c91a7cac2edd6e9133871cd45ab1b08d377165
font_01_sfnt_off00011105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11105 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12917 17596 bytes
SHA-256: a608b30d32dad4ddb251aa2ec0f362a311657343d5327cc095434bc206b91fb9

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