Malicious PDF — malware analysis report

Static analysis result for SHA-256 129072e282117f1f…

MALICIOUS

PDF

85.7 KB Created: 2021-09-17 01:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3f97b23d66c909695707384eb1bd6493 SHA-1: d4fe6d6ffb529453fad2ffe33adfdad58535e55c SHA-256: 129072e282117f1f943bedc24b108ad2fc37b19804c3216352ab3a3c829da133
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one specifically using a UTM term suggesting a lure for 'financial accounting book pdf'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a pattern of using disposable hosting for link farms, reinforcing the phishing or malware distribution motive. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest this PDF is part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=financial+accounting+book+pdf PDF link annotation
    • http://sevvalturizm.com/rsm/files/39574225918.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161405af583245---zepinaga.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/jelorasajalarusibazoxi.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210917063101824.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c76433f975---20778793393.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/romamijado.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/posedef.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/64212298484.pdfIn PDF document text
    • http://web5gstore.com/Files/files/38910026218.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/sugitedefefid.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/sikakulum.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/28579961513.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/nenemagudusawesu.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/sosiwon.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021090916523273499.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021091220293373499.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/xutuwirisir.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/gerir.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/24200457565.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/pobinobewogowobofukifod.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/kulipovajepeb.pdfIn PDF document text
    • http://ausafe.net/images/art/files/24718472489.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/buzupisa.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_off0000ebf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001040a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040A 17524 bytes
SHA-256: 3bf6d33bae7857b0e14e88309624cb5ce42a754e68cacd440a7dd4a21a53b52a
font_02_sfnt_off00013110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13110 10704 bytes
SHA-256: 05361796bc7357563dd42a9e38a6b5fcc3030fc1b90225f87b6d45202605d234

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