Malicious PDF — malware analysis report

Static analysis result for SHA-256 b877aa608f9457fc…

MALICIOUS

PDF

81.1 KB Created: 2021-09-10 14:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7e137a973f695e429fe95fb0f56dac59 SHA-1: 8667807597b5634265a3b132705defcc809036f0 SHA-256: b877aa608f9457fca70af312cc64aabb495763683cf01914b0002b7395e1a839
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is designed to funnel traffic to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://coretry.ru/uplcv?utm_term=galaxy+note+4+screen+size PDF link annotation
    • https://hilanguage-com-tw.triangle-design.com/files/sojalobizixokudarob.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/sadagek.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/ziretujesajeb.pdfIn PDF document text
    • http://leguido.net/files/16503524440.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/nuzutopuzijoduzigubo.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/mefegoruka.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/lemupaf.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/japoxiveredefalasozixatid.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/nesaletofirepumip.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68147778246.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/34479347295.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/34333113306.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/70509564982.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/wujefiranamuwikakip.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/fimitusit.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/nibefizitimufirinujumezi.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/12890193170.pdfIn PDF document text
    • http://chinahongji.com/d/files/37075380832.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/kozixilaxu.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/40401762422.pdfIn PDF document text
    • http://kite-surf.sk/files/91348629400.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/fonorufab.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/zudebawirenoridib.pdfIn PDF document text
    • http://htwy.com/upload/file/pininipibizasunetip.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_off0000d768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD768 18124 bytes
SHA-256: 702d1e69f56bb08ad5cff4894672722787da4c68537c5e3d326e42f70a880ebc
font_01_sfnt_off0001061b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E32 10616 bytes
SHA-256: 568e2cdbdd2778226ec71e7061eed895dcb1317252ee5ea92721c3d6b8726e9e

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