Malicious PDF — malware analysis report

Static analysis result for SHA-256 0926eb37be39c8cb…

MALICIOUS

PDF

81.9 KB Created: 2021-03-16 10:48:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf02b45043b044cf8785e1244385bf43 SHA-1: b9a7494cf9d5bfba1083e1d59a743863411e78ce SHA-256: 0926eb37be39c8cbfb4d9e3265a0ff3392593a50f858840a2f458ec7f4715eda
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a site that appears to be part of a link farm for SEO manipulation. ClamAV and an ML classifier identified this PDF as malicious, specifically a phishing trojan. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://leonvi.ru/wix?keyword=ga+motorcycle+permit+test+study+guide
    • http://vumonivaxozutod.mypressonline.com/where_to_buy_stackable_washer_and_dryer.pdf
    • http://jagefefixod.22web.org/gaming_pc_build_guide_under_600.pdf
    • http://kobivoweder.mypressonline.com/juzubenulumoximufisetu.pdf
    • http://xajabuzowa.scienceontheweb.net/24841280569.pdf
    • http://gavolav.mywebcommunity.org/59774756842.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/zalomi/transformers_5_autobots_wiki.pdf
    • https://s3.amazonaws.com/wofaxil/nature_by_ralph_waldo_emerson_free.pdf
    • https://s3.amazonaws.com/dudigonifu/bedurebuvob.pdf
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_299ae7a86ab34405bc78bc415048747e.pdf?index=true
    • https://s3.amazonaws.com/rolefosiju/40688782172.pdf
    • https://s3.amazonaws.com/dutuzanob/folotejunanowanadubezalig.pdf
    • https://s3.amazonaws.com/zumomasugipeno/65864773028.pdf
    • https://uploads.strikinglycdn.com/files/0f59a827-9de2-4275-8362-b207c5a5fc41/fefowubete.pdf
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_25868b154f624d80bcb9855db186d35f.pdf?index=true
    • http://molulig.epizy.com/advertising_and_public_relations_research.pdf
    • https://uploads.strikinglycdn.com/files/aa74e73a-5169-44b3-9daf-a476d7134ccd/82863484896.pdf
    • https://s3.amazonaws.com/votuweroxigezog/how_much_does_chick_fil_a_pay_per_hour_2020.pdf
    • https://uploads.strikinglycdn.com/files/fb66cd3d-d828-45f6-994f-b5dce3c97535/43763032807.pdf
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_20bf1538459b45e9a1c748caf5fac779.pdf?index=true
    • https://ec560393-4650-4708-bf0c-d08fceb8458c.filesusr.com/ugd/ca69db_e7d71e9c00524a9eb3038d6b9b09fa88.pdf?index=true
    • http://bewomad.rf.gd/78226482953.pdf
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_e8d420e031a44a8fb990473b1489357f.pdf?index=true
    • https://s3.amazonaws.com/risalenefazozo/periampullary_tumors.pdf
    • https://uploads.strikinglycdn.com/files/082c9267-a59c-4128-8fab-eef4deac968b/mevoretozonizuxaso.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f448.bin
51b8c4005773b1d6df25b2ac5d57a6d8abe99cb969c481e8d0c4177004725b0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF448 5304 bytes
font_01_sfnt_off00010667.bin
609003d7fb8b94083384b632825535dc5f6bc1b8b88946a2a2f8a792e8d84db2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10667 10964 bytes
font_02_sfnt_off00012bf6.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF6 4324 bytes

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