Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b20a7a6c7380797…

MALICIOUS

PDF

76.9 KB Created: 2021-02-13 05:41:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e173124137b3f3957adde4e89e014b2a SHA-1: ecd73eef60ccb70fd3e4a0752c31367f4c80120f SHA-256: 9b20a7a6c7380797362ee9e4d01b7f26b59c6585f7948f53d7a35b74d3e39dca
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, with one prominent URL pointing to 'leonvi.ru' and containing 'utm_term=divergent+free+book', suggesting a lure for a free book. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, reinforcing the phishing or malicious download intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/123?utm_term=divergent+free+book PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403410/normal_600c9219f185e.pdfIn PDF document text
    • http://zunejabilake.22web.org/71982186820.pdfIn PDF document text
    • http://pagipuniluti.iblogger.org/gifonodikoxepo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377924/normal_6009f6b8af702.pdfIn PDF document text
    • http://kanudivuvim.iblogger.org/ameryka_pnocna_informacje_dla_dzieci_prezentacja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388426/normal_5ff768047e7b5.pdfIn PDF document text
    • http://mainsale.info/538065144055mytk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382789/normal_5ff78453223aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476443/normal_601510ce04666.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454677/normal_6022e5d5ea1cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470532/normal_5fe41a6869fb8.pdfIn PDF document text
    • http://m-laskin.ru/mozilla_firefox_old_version_free8c21e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412170/normal_5ffa5cfb9bd7a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sivonimowonaze.rf.gd/avg_antivirus_free_till_2018.pdfIn PDF document text
    • http://siwomiwededu.epizy.com/8292568482.pdfIn PDF document text
    • http://gazugitub.epizy.com/lepodeninofakafadozudi.pdfIn PDF document text
    • http://palalujopaxuv.epizy.com/39548799436.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/bluetooth_peripheral_device_driver_hp_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/gapuno.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/open_office_spreadsheet_auto_filter.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF466 4780 bytes
SHA-256: 6470d066c7780bb591213c7100905f0657cefa438079bbdd455aa777da434cbf
font_01_sfnt_off000104d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D1 9916 bytes
SHA-256: 573538788fab712b528132a047fd19ec33cddfc277b2769372d09a27d2f4e0ad

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