Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ab836cf4a8744b5…

MALICIOUS

PDF

90.7 KB Created: 2021-02-22 10:41:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6b3e15fc84abaeede689d4d33342cc16 SHA-1: b03377c4a6eda491a9a1175c90af8a608fe745e5 SHA-256: 8ab836cf4a8744b57eef77bd96e1b97b4524062009d563258a836f9e22320ae8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous URLs, many pointing to disposable hosting, suggesting a link farm used for phishing or malware distribution. The embedded content, though heavily obfuscated, likely serves as a lure to encourage interaction with these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://seumenha.ru/wb?keyword=mini%20dv%20tape%20camcorder%20for%20sale%20australia PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454303/normal_5fcd579e83c14.pdfIn PDF document text
    • https://ludurodeb.weebly.com/uploads/1/3/4/8/134852143/fokidamob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380395/normal_602c9636b5479.pdfIn PDF document text
    • http://dfahsdfgjsfg.online/kajoru2etxj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492875/normal_5ff4d21e7623b.pdfIn PDF document text
    • http://knitfqph.site/breitling_aerospace_e75362_for_saleq3xz6.pdfIn PDF document text
    • https://bewabolome.weebly.com/uploads/1/3/5/3/135347927/8504408.pdfIn PDF document text
    • http://wojifos.22web.org/schaums_outline_of_signals_and_systems_4th_edition.pdfIn PDF document text
    • https://jetukuzimol.weebly.com/uploads/1/3/2/6/132695660/5629924.pdfIn PDF document text
    • http://leadtop.co/how_to_use_canon_powershot_sx430_is5gymn.pdfIn PDF document text
    • http://teachost.com/49007955482ar9iz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457330/normal_60237313aff64.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pulilidason.epizy.com/67242548107.pdfIn PDF document text
    • http://wulukexererumus.epizy.com/topinoviliwukemilunuvu.pdfIn PDF document text
    • http://zamoguwudegovo.rf.gd/nimegunuwarukoput.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE2 5368 bytes
SHA-256: 64da68b7bbdae6fc315e2ecec9118f101f87188ff3df28b147c93554476535a3
font_01_sfnt_off0000fd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD18 9404 bytes
SHA-256: 11e19c1da08019387cecaa1cb42207e0f39505e78133e733792a0c7b2272f333
font_02_sfnt_off00011ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC4 12180 bytes
SHA-256: b2564dba54ed32b64acf21de7fe1c4cd0bd9ff1eb49e254a2795bffa7e3faab6
font_03_sfnt_off0001437e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1437E 16912 bytes
SHA-256: d72dc20e249d01f4d56fa7350f6c9288c0cdb927a9e871670421ce085873f66b

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