Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebdb209c65aa23bd…

MALICIOUS

PDF

78.2 KB Created: 2021-04-01 01:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: eeb7ab468390a14110584ded5eb0c896 SHA-1: 361d701654762f3a28046b117be73cff3a783b4d SHA-256: ebdb209c65aa23bd274169a27c02fc994fbcb08894e5f4f4dc40853bc53dfe6d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the 'PDF_SEO_LINK_FARM' heuristic, pointing to various PDF files. One of these links, 'https://fokemale.ru/award?keyword=periappendicular+infiltrate+pdf', is directly embedded and likely serves as a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. The presence of embedded URLs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://fokemale.ru/award?keyword=periappendicular+infiltrate+pdf PDF link annotation
    • http://mimudobaros.22web.org/39288673054.pdfIn PDF document text
    • https://cdn.sqhk.co/dukasavubu/geWSif0/tafolasurevowavorazetevu.pdfIn PDF document text
    • https://pegujugadul.weebly.com/uploads/1/3/1/6/131637136/3630f0b0e84.pdfIn PDF document text
    • https://cdn.sqhk.co/sabumijobude/hha9lih/gujukuj.pdfIn PDF document text
    • https://cdn.sqhk.co/waderapal/TaWhzf7/dead_fortress_zombie_defense.pdfIn PDF document text
    • https://saranadizalexe.weebly.com/uploads/1/3/0/9/130969301/regitodudifevogaxi.pdfIn PDF document text
    • https://xeruzorajudobux.weebly.com/uploads/1/3/4/6/134605969/1648196.pdfIn PDF document text
    • https://cdn.sqhk.co/bidamasegom/ighb0ij/zewapupifojininagofafajim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dafumuxitupav/premiere_pro_equivalent_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/charlie_full_movie_free_isaimini.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/65257817113.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/75710909025.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/26423424822.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/pijiburujowokowe.pdfIn PDF document text
    • http://gefuxuxoj.epizy.com/bose_wave_radio_iii_manual.pdfIn PDF document text
    • http://bukufam.epizy.com/aashiqui_2_naa_songs_mashup.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/novorezize.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/dolepawosog.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/lovojat.pdfIn PDF document text
    • http://dapubul.rf.gd/66815944144.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B7 4744 bytes
SHA-256: cb9a24cb1266af504a6519f502038a4ce04bb11f891738b3999407368bb425db
font_01_sfnt_off0000f8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D2 10800 bytes
SHA-256: 843065b2fdd919a861df0a85109d25f0a2cd08515e05baf80919e778ac1d896f
font_02_sfnt_off00011d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D15 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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