Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad539be7329f63b4…

MALICIOUS

PDF

142.4 KB Created: 2021-05-10 08:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 0d4a029bffa32d176e109692fb21c726 SHA-1: 845aab7f59fb96b2c77448ffde33b0a438e2ade8 SHA-256: ad539be7329f63b4021b054ac624ed1e019782de1b8e06a121d2f16c03262830
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing lure. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly suggest malicious intent. The embedded URLs are likely used to redirect users to malicious sites for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://pelibifir.ru/strik?utm_term=the+communist+manifesto+analysis+essay PDF link annotation
    • https://cdn.sqhk.co/nasubivapu/if58RRX/download_apk_b612_beauty_dan_filter_camera.pdfIn PDF document text
    • https://cdn.sqhk.co/leluforeref/hficjhF/brittle_starfish_classification.pdfIn PDF document text
    • http://autobuff.xyz/moxovisuxezuy4ziy.pdfIn PDF document text
    • http://lienforkid.com/mozilixegijamabiwvy1m.pdfIn PDF document text
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/7518636.pdfIn PDF document text
    • http://ridunculus.com/34401123959ricvo.pdfIn PDF document text
    • https://cdn.sqhk.co/pasojixaju/cpOOjgd/kekidufarinirok.pdfIn PDF document text
    • https://rulorakaduf.weebly.com/uploads/1/3/4/4/134480735/powufaretokugaw-zuduxideg.pdfIn PDF document text
    • http://zerusuwunilex.22web.org/lusadoporate.pdfIn PDF document text
    • https://fobabugukejapa.weebly.com/uploads/1/3/4/5/134576868/tavuzi-xunexuwow-felabez-noretagewalejir.pdfIn PDF document text
    • http://dewodalaluw.mygamesonline.org/oxford_bookworms_level_test.pdfIn PDF document text
    • http://mojenisijita.mywebcommunity.org/determination_of_coefficient_of_consolidation.pdfIn PDF document text
    • http://jumpfs.space/harry_potter_envelope_template_freexn76s.pdfIn PDF document text
    • http://mobeditobaxul.scienceontheweb.net/45608631399.pdfIn PDF document text
    • http://kpovli.ru/bear_cruzer_bow_specs5yjr3.pdfIn PDF document text
    • https://naxulukituno.weebly.com/uploads/1/3/4/8/134879135/5587610.pdfIn PDF document text
    • https://popoxalisasuper.weebly.com/uploads/1/3/0/7/130775362/pidelefajutov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://misosemarimo.rf.gd/luthers_95_theses.pdfIn PDF document text
    • http://fufagagebo.epizy.com/1357608749.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c0e16a7-2598-4973-bb3c-d24c8a80e2ad/tilipesaduzem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77b17aaa-8a67-493c-a38b-16c709f7731c/75275133538.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/977efceb-dbd0-4a64-930b-5f993ccd5b3d/a_clash_of_kings_vs_a_game_of_thrones.pdfIn PDF document text
    • http://vupaguriwedizid.atwebpages.com/63445856356.pdfIn PDF document text
    • http://vokorugagamozi.rf.gd/pegijisem.pdfIn PDF document text
    • http://sagoralezerelo.onlinewebshop.net/xexejawutotegivuxukim.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E046 5076 bytes
SHA-256: cb3fab0965648cf5738b3271209687f149df55e4ebff1806409f22bd88a35492
font_01_sfnt_off0001f173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F173 10460 bytes
SHA-256: ebe1a1b9c8d2177b6d64e7aa6a28131e1a6ddf9bb436a37241a054f9bff05e96
font_02_sfnt_off00021552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21552 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e