Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb13ad35f32f6464…

MALICIOUS

PDF

85.5 KB Created: 2021-09-19 15:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6fe1710cb83e5d8042042581e69fdac9 SHA-1: b0e95eac00c4a1cfbbb7e10a42a04a39f8006a05 SHA-256: bb13ad35f32f6464f0a55e2b36390c136db77a3a22af2460c265bdcb977560f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to direct users to malicious content. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://archism.ru/uplcv?utm_term=how+to+enable+cookies+on+your+android+phone PDF link annotation
    • http://lexprikson.com/admin/style/images/userfiles/file/gelonurutijusumevozula.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/xirasazajevugokuz.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/24498066149.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/kukoxeruzopabumoze.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/38493033.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/vubojanimofutemubip.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/peledov.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210901212144.pdfIn PDF document text
    • http://alltechsro.cz/files/13254810644.pdfIn PDF document text
    • http://hongdacable.com/d/files/duzawaranejitoji.pdfIn PDF document text
    • https://bdata.vn/upload/files/15590530661.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/3thbpu1ta10scck6qma3ngtp2n/35514412260.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/vavobubaxawuvorinogulip.pdfIn PDF document text
    • http://esteel.my/userfiles/file/73109786997.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/22599955222.pdfIn PDF document text
    • https://everestart.com/images/stories/file/raluvevoxu.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/fewobosonutupizoso.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/timedaduselosubefafomisez.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/mujijafu.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/nunejekofebowolile.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/mowunexa.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210919_163126.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/wigagotutipumivejatopug.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_off0000e833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE833 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001004a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004A 11132 bytes
SHA-256: c261d9d0cddeebd8485a44378dae2e057b04d557a7208f555b8b11bbbaaed04b
font_02_sfnt_off00011a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A06 17620 bytes
SHA-256: b31aaddfa1dc17df259ff532b8cfd03eba4cf8fb67e9c039d01b857f8975b237

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