Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43e1d5db8397ecb…

MALICIOUS

PDF

78.4 KB Created: 2021-03-23 02:13:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 79f1aa92cdaeb93ddd68b82c097acc25 SHA-1: 219f4907b11ba30e1a393127904354942c1d2577 SHA-256: c43e1d5db8397ecb54da178402e1eecab814978de4872d94df4a0346ae06624f
186 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 disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://vilenefex.ru/strik?utm_term=how+to+structure+a+5+paragraph+essay PDF link annotation
    • http://xuxijosut.sportsontheweb.net/78174593130.pdfIn PDF document text
    • http://helplnstagramcontact6088758.com/gusidetunud04f4.pdfIn PDF document text
    • https://cdn.sqhk.co/tevunufoba/jQnibgc/lara_croft_relic_run_download_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wemavutulow/5jfz0gg/5682935277.pdfIn PDF document text
    • http://frankiearvelo.com/95213961795cyd39.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/iiia8if/cowbellpedia_2020_website.pdfIn PDF document text
    • https://cdn.sqhk.co/gukisafuw/Yggcx2u/zulibunifitanurosu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445890/normal_60068e6c2c817.pdfIn PDF document text
    • https://cdn.sqhk.co/zufutetuwume/cCGIjfX/99693614611.pdfIn PDF document text
    • http://rameautbxy.space/is_outside_an_adverb_or_an_adjectivewqs8a.pdfIn PDF document text
    • http://kalukoroduro.mygamesonline.org/72645183808.pdfIn PDF document text
    • http://balegetiwep.mywebcommunity.org/autocad_2020_3d_commands_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479237/normal_6018d0be6a972.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzalolotagi/tjZhcEB/nujulonujamofisatilewodit.pdfIn PDF document text
    • http://899themes-demo.ru/ielts_book_6_reading_test_2_answerskqgi6.pdfIn PDF document text
    • http://marketitaly.info/classical_music_criticax89h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414871/normal_60342c02aea7e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://351e5f87-f9e5-4015-92cd-d601692b9ec3.filesusr.com/ugd/a0d0d3_9381562cbfd347589f9c21207b99b5b4.pdf?index=trueIn PDF document text
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_62dfb678b0cf48bbb5016962e0e5747c.pdf?index=trueIn PDF document text
    • https://167c8e7b-8160-49a2-a88e-f26749d647c8.filesusr.com/ugd/1ad47d_7918a11e7e5d490597bd02d2d2733d91.pdf?index=trueIn 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_off0000f500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF500 5444 bytes
SHA-256: 24612f5e7249de0e56a063fbc6c65b34374ea3f536f97fdb1475e32d6f140b67
font_01_sfnt_off0001079c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079C 10608 bytes
SHA-256: 368122526e812ab44d146eec74d4dc9221cb91a6d264ea2707821fd8493a776a

Open this report in the interactive analyzer, or submit your own file for analysis.