Malicious PDF — malware analysis report

Static analysis result for SHA-256 7845f1f8b61219c2…

MALICIOUS

PDF

100.3 KB Created: 2021-05-09 14:40:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: db36678e9adb1e2ee4fe66d5d6c45cfd SHA-1: 54c1e20940e5cdcd7941be8281f63c46ace09de8 SHA-256: 7845f1f8b61219c24da7a87207a4b508a1f01ce2e5ffb58a94ff556919d07484
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 of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to harmful content or malware. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

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://jumiwimov.ru/strik?utm_term=little+red+riding+hood+horror+movie+2015 PDF link annotation
    • http://sepoxudozixo.sportsontheweb.net/fumumilobubeperuwegexa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383795/normal_5fe834e024654.pdfIn PDF document text
    • http://pokemonrivals.online/wafetajimevau8utq.pdfIn PDF document text
    • http://yildirimotobursa.com/ansible_interview_questions_and_answers_for_devopsudshd.pdfIn PDF document text
    • http://afracheat7.xyz/totagapabusuxiwopufwatvx.pdfIn PDF document text
    • https://libizewixowu.weebly.com/uploads/1/3/4/4/134432873/nunuxibolu_wutajivire.pdfIn PDF document text
    • http://wazepewazivulil.mywebcommunity.org/toshiba_vcr_dvd_recorder_remote.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465919/normal_600405b973d64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415754/normal_6064622073d60.pdfIn PDF document text
    • https://tuxotise.weebly.com/uploads/1/3/1/3/131379496/jemopid.pdfIn PDF document text
    • http://yognat.space/assassins_creed_brotherhood_book_read_onlinev3jc0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://boxijekew.atwebpages.com/29041307459.pdfIn PDF document text
    • https://s3.amazonaws.com/ponivotigegepub/xifuwin.pdfIn PDF document text
    • http://zedebegeku.myartsonline.com/bangladesh_map_file.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/dibekiwofen.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/mabegaxomidirituv.pdfIn PDF document text
    • http://peledopa.myartsonline.com/ryobi_4_cycle_trimmer_oil.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/15979094548.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/kidde_nighthawk_manual_kn-cob-dp-ls-ca.pdfIn PDF document text
    • http://jofikuv.atwebpages.com/avid_bb7_instructions.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001381e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381E 4748 bytes
SHA-256: 164b27379f6937e35a22544e1ec73316709e773dfcc19d441f31c3771093acf9
font_01_sfnt_off000148b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148B8 5300 bytes
SHA-256: abe203b054e193a4f009e7353bd50f7c4f90c6042cb8c1845d2bce40ba6ddc9d
font_02_sfnt_off00015aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA2 13028 bytes
SHA-256: 3a15117e0ce74b530d78a38efab290ecca74ca6937dd21c263a396251aad0ba2

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