Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0d448eb97cf3cb0…

MALICIOUS

PDF

76.1 KB Created: 2021-03-01 18:55:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: deb1a225ec9a92c15561bb3f1872a184 SHA-1: 200121c7ad4c38a68e314ec0190a028c72cba247 SHA-256: a0d448eb97cf3cb01dad4a97e47de516b2deddc31f99627b575656340f03aae8
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, and the ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the overall structure point towards a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://kuzutuzo.ru/wix?keyword=worlds+hardest+game+unblocked+66 PDF link annotation
    • https://mixuvuweti.weebly.com/uploads/1/3/1/4/131483588/poviwiwe.pdfIn PDF document text
    • http://copyrighthelpptteam.com/mp3_download_manager_mdm_indirxpozp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464067/normal_6019033f48e9f.pdfIn PDF document text
    • https://ruvedusipokowu.weebly.com/uploads/1/3/0/8/130813644/14bb6.pdfIn PDF document text
    • http://shtancircul.site/99323121655ykwoe.pdfIn PDF document text
    • http://lofitner.buzz/wetakozumakefixu0hma6.pdfIn PDF document text
    • http://detonicro.website/29922221821ylkt6.pdfIn PDF document text
    • http://supermagazforsale1.xyz/48574956924y9ftj.pdfIn PDF document text
    • http://iciko.xyz/41487176012pwrw8.pdfIn PDF document text
    • https://lazesomixasima.weebly.com/uploads/1/3/4/5/134588612/d22652b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fofeguj/types_of_ballroom_dance.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/jizuzube.pdfIn PDF document text
    • https://s3.amazonaws.com/gusule/masilolijabidajisurasotof.pdfIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/zudolix.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/google_docs_sheets_and_slides_for_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/kijagejekogit.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ece1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE1 5724 bytes
SHA-256: 57d1e5d2b60dc3917641b794ad83291e0ff17167098ad5e4b3f0cf97010d56ee
font_01_sfnt_off00010039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10039 10208 bytes
SHA-256: 625a949e4172bd578b62e88be3e46369195df76e8bd32964efbbab21c65fee19

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