Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2f64646a047e2f1…

MALICIOUS

PDF

68.8 KB Created: 2021-09-26 02:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: edcf2fa998680a42e0ea83c42ae0d8d2 SHA-1: fb2198ce323e7d56d3229e99dc3d10db30d981b6 SHA-256: d2f64646a047e2f120349f96a2e9ec899b9bd5a3dd327082ac624bfad7271739
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm hosted on disposable domains. The embedded URLs, such as 'https://crysiq.ru/uplcv?utm_term=swashbuckler+pathfinder+guide', likely serve as entry points for further malicious activity, such as phishing or malware downloads. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=swashbuckler+pathfinder+guide PDF link annotation
    • http://vietdubai.com/userfiles/file/kutusulidonixobosivezanof.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/dadodazixazapegi.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/28812369200.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/35385025233.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/bezupilavejug.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/73655100597.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/suserojufu.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/63532288864.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/wapevojuve.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/61446601407.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631933989.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/jozoloripufinanes.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/88575490864.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/xemuvudinakiwanuxo.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f63ca57c1---62025562390.pdfIn PDF document text
    • http://xn--b1afbmo0alc.xn--p1ai/ckfinder/userfiles/files/jufofawukupiligotu.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/vokujubozuzeta.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/zafifuzamisab.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/rokajerudakijuvobujozoro.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/60408081387.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/57445273720.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/43107643380.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109130744512309.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://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_off0000ada3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADA3 11272 bytes
SHA-256: b7e379d0ed6f3e88a1ec31f0b94338d8e8f32fd0a0e5d74d7b2e7a4e11e451e3
font_01_sfnt_off0000c7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A9 15044 bytes
SHA-256: 268bbb4e12ac01d5f79fbaf71cefaca50b07ca3c462d2733c6fc125d2bbddf61
font_02_sfnt_off0000edc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1