Malicious PDF — malware analysis report

Static analysis result for SHA-256 e227e3b681c670e4…

MALICIOUS

PDF

67.9 KB Created: 2021-09-21 17:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e410fc1fb021abed67ee905815fbc735 SHA-1: 534abba04815f59056ddf7f2fa0d2ac8664effa5 SHA-256: e227e3b681c670e4c2f50695d8c07089a8a34d954dd96c2e0ffa11246d657c46
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://queure.ru/uplcv?utm_term=how+to+download+themes+for+android
    • http://hifitness.hu/userfiles/file/51801009086.pdf
    • http://ambvet-trefontane.eu/userfiles/files/vedawunij.pdf
    • http://asbazainville.org/userfiles/file/88628275524.pdf
    • https://sanipro.ma/app/webroot/uploaderfiles/89294421089.pdf
    • http://omegapizza.net/uploads/files/61293839444.pdf
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/ponek.pdf
    • https://yennenga.org/business_school/uploads/file/69741692217.pdf
    • https://0a3exp.com/upfiles/editor/files/55182710546.pdf
    • http://sintellect.ru/Repository/file/73472841281.pdf
    • http://uniradioweb.info/userfiles/files/3538758653.pdf
    • http://pnalog.ru/images/file/popofamolefafipelepitome.pdf
    • http://proart.by/media/file/welet.pdf
    • http://brenderup.ro/mm/file/wujisofevaxazigabe.pdf
    • http://asiavent.com/UserFiles/file///zagevomewofikojemimibag.pdf
    • https://jss-moms.si/upload/File/wimesop.pdf
    • http://dr-temt.ru/images/file/maxawagewilepumejaruruvul.pdf
    • http://kovofilm.cz/userfiles/file/89054712247.pdf
    • https://www.hosotte.com/ckfinder/userfiles/files/puramevu.pdf
    • https://hsiaoying.com/userfiles/file/91734859949.pdf
    • https://onutglen.com/caningest/images/file/44539026172.pdf
    • http://ipoz.pl/userfiles/file/44884063951.pdf
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/14819637784.pdf
    • http://hoangle.vn/uploads/userfiles/file/11340145487.pdf
    • https://binarbaidrealestate.com/public_html/userfiles/file/nategezoxowidezepuvajuro.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE82 16792 bytes
font_01_sfnt_off0000c699.bin
3d031f2e336aaa64fc4f7e8145e90ba64256f65a31c7ee62acad7050abed8ac7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC699 10696 bytes
font_02_sfnt_off0000dee7.bin
6bc0e95894d104f71cfb99ce3da0d760be3c2f8c5545e1e96d7fbb237cdf5454		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE7 14148 bytes

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