Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07db2e07bd703af…

MALICIOUS

PDF

77.5 KB Created: 2021-05-15 02:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edabdb43e9f3490cc064d2315927dfe4 SHA-1: ef4f839871bda59970c17facefd83c4ceb1e29a5 SHA-256: a07db2e07bd703af024674aa97207b3d43ada917fbe1dc2f959f2eaff0e7043d
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs, with a prominent one leading to 'jacksth.ru', suggesting a phishing or malware distribution attempt. The PDF's structure and embedded links indicate it's part of a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://jacksth.ru/strik?utm_term=what+type+of+dragon+are+you+wings+of+fire+quiz
    • http://tokio-2020.fun/wosomop93f81.pdf
    • https://cdn-cms.f-static.net/uploads/4407781/normal_5fd8915c4b5bf.pdf
    • https://static.s123-cdn-static.com/uploads/4428342/normal_5fffbf42d071d.pdf
    • https://cdn-cms.f-static.net/uploads/4388421/normal_5fd30ffd91e05.pdf
    • http://xudogiborijum.66ghz.com/android_tv_remote_keyboard_app.pdf
    • http://argo-tourism.com/sherlock_holmes_a_game_of_shadows_full_movie_download_in_hindi_hd94kuz.pdf
    • http://totalcreditreport.info/dovuxowofugodika17h92.pdf
    • http://help-verifiedbadgecenter.com/newajun43edn.pdf
    • https://static.s123-cdn-static.com/uploads/4503617/normal_60022094df678.pdf
    • http://golomashvanna.xyz/1677668836np054.pdf
    • https://static.s123-cdn-static.com/uploads/4412394/normal_5fc63fa74b5a6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://43466d02-873c-4564-b63c-f2f79aa6d38e.filesusr.com/ugd/fd64e8_a17d6c05404d44d19f79b61a4219dfd2.pdf?index=true
    • https://s3.amazonaws.com/pilazi/samidakutogev.pdf
    • https://s3.amazonaws.com/fizaxo/verebagazusu.pdf
    • https://0ea28b16-58c2-472d-b6be-3e97fe9b7bb6.filesusr.com/ugd/696b8a_44d3ffe1fa7245cc92fd0c71b4b4337c.pdf?index=true
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_6c02c33738c54c3b83ac1318246ca014.pdf?index=true
    • http://vaxutusurinav.epizy.com/vezifipagitadogozij.pdf
    • https://s3.amazonaws.com/fidobakipivogit/vukapogotulotivin.pdf
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_c39097fe909242a38f2dd9674ce32355.pdf?index=true
    • https://e0ff2378-281a-4ea3-95ae-419c526fdc99.filesusr.com/ugd/0baf77_ad203af6d1124a5298602531fef181fc.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef48.bin
ddae0a687285103c18de3be8db8dfcd160a283e96dc224bb5598e04c498faae8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF48 5656 bytes
font_01_sfnt_off000102a8.bin
d03297a9e6fd7e7ff0dec9c32637f9e97e411dada6fcc2c81c9201bf44fe42ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102A8 11156 bytes

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