Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf2e2a063784d64…

MALICIOUS

PDF

85.7 KB Created: 2021-01-21 15:30:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e077135cf3efd5e4e77962b38070032f SHA-1: d18f61588b3a3c9b7373bfe9b7bd1c0077b164ec SHA-256: 0bf2e2a063784d64bf4b67b9a6377c75b6bcec4b6133d8b08ccff4902d56fb5d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly and other file-hosting services, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and extensive external linking are commonly used to redirect users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=realidades+1+capitulo+6b+actividad+3+answers
    • https://ginadilu.weebly.com/uploads/1/3/4/7/134768391/dokorubilipuji-wamezolajuzima-mekiwaruti.pdf
    • https://zikamesezelili.weebly.com/uploads/1/3/4/8/134857079/1354992.pdf
    • https://cdn-cms.f-static.net/uploads/4391303/normal_5fadd296d8373.pdf
    • https://site-1235963.mozfiles.com/files/1235963/aquaman_movie_trailer_hd.pdf
    • https://site-1178004.mozfiles.com/files/1178004/cadillacs_and_dinosaurs_game_android.pdf
    • https://lodikesilir.weebly.com/uploads/1/3/4/8/134868057/e6e6a450d0a94.pdf
    • https://static.s123-cdn-static.com/uploads/4499656/normal_5fd090b529279.pdf
    • https://tijirurilulade.weebly.com/uploads/1/3/4/3/134312421/nagozemewadafif.pdf
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f86f4d761046.pdf
    • https://site-1178750.mozfiles.com/files/1178750/85271509245.pdf
    • https://site-1176903.mozfiles.com/files/1176903/talking_tom_friends_app_store.pdf
    • https://static.s123-cdn-static.com/uploads/4450884/normal_6006366baf093.pdf
    • https://static.s123-cdn-static.com/uploads/4413017/normal_60024c2732963.pdf
    • https://static.s123-cdn-static.com/uploads/4366369/normal_60010f5ca0cfb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ralomefin.epizy.com/tidasamaf.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://scripts.sil.org/OFL
    • 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_off0000f802.bin
eb04c3b904a5f6dcebedae7c5eec774303568d2c6fd518430b564bc94967648b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF802 5736 bytes
font_01_sfnt_off00010baf.bin
e93c74ddd7cc6e382251487e140a50f3b767b4a1d9c3a96910b75aa72b7a5504		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAF 12276 bytes
font_02_sfnt_off00013401.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13401 16204 bytes

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