Malicious PDF — malware analysis report

Static analysis result for SHA-256 e366ba27fe726b38…

MALICIOUS

PDF

72.6 KB Created: 2021-02-21 19:49:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6bd52d1bb54d46dcf2d766e81fe6d761 SHA-1: 50da6f45c5f36e56a0d1a50bc11979da71675be7 SHA-256: e366ba27fe726b3896e21f2e9b47360f1b2d5412581b4cffbf99a13fe68d0159
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'maypoin.ru' and containing a 'china stock market' query, suggesting a lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, further supporting a malicious intent to redirect users.

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://maypoin.ru/123?utm_term=china+stock+market+today+live+chart PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485587/normal_5fd711e57091d.pdfIn PDF document text
    • https://pexasuwen.weebly.com/uploads/1/3/4/5/134593650/delifavani.pdfIn PDF document text
    • https://kunipasufit.weebly.com/uploads/1/3/0/8/130874165/8652385.pdfIn PDF document text
    • http://xazivigufimu.22web.org/shatta_wale_my_level_mp4.pdfIn PDF document text
    • https://matelusa.weebly.com/uploads/1/3/1/4/131406649/3109656.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484834/normal_6021242bb526a.pdfIn PDF document text
    • https://pusesame.weebly.com/uploads/1/3/4/6/134662227/dezepujokawedab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492286/normal_601d507fdcea0.pdfIn PDF document text
    • http://stickerrus.ru/blowin_in_the_wind_songzeqdy.pdfIn PDF document text
    • http://boludibaderujir.22web.org/neverending_story_dog_thing.pdfIn PDF document text
    • http://kprovk.xyz/celtic_alleluia_walker6p25h.pdfIn PDF document text
    • http://gooddevice-online.com/what_is_canadian_national_sportdsl3z.pdfIn PDF document text
    • http://life-news.tech/azur_lane_eagle_union_fleet_guide53esm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xezerubewuxa.epizy.com/duplicate_marksheet_application.pdfIn PDF document text
    • http://familule.epizy.com/54322002861.pdfIn PDF document text
    • http://tudifilik.rf.gd/taxipiwumu.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_off0000de0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0A 5312 bytes
SHA-256: 7611559ff17500164655f5afe69d00fd83e5ff2d58284f5e66b824e55afcf4b8
font_01_sfnt_off0000eff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF5 11056 bytes
SHA-256: 0c0609aa28ffabaa17418201cd9d602564df24f39ac4a73734066a3eebf18bab

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