Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c97263d0aa863d…

MALICIOUS

PDF

71.3 KB Created: 2021-09-16 07:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6cb8328b5e9509a1473b81bcd9fc25e8 SHA-1: f60fa851d873af773fc92f6d68c9750ecd722096 SHA-256: 35c97263d0aa863d8fca9d83b7be5979803c263542819dd22f3d0c01713d9218
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting, commonly used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=asi+se+dice+level+1+teacher+edition+pdf+answer+key PDF link annotation
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/noromobojozite.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/kuxebinuradojifa.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d07b732edf---vovavesivagunexoxidasege.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/44633709014.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/ruluwasipamemofomano.pdfIn PDF document text
    • https://dm288.rs/slicice/file/38375805482.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/nunapisudageg.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/18756827201.pdfIn PDF document text
    • https://kawanmto.com/contents/files/woruzivipubaketejajome.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/mopiwopegotusexu.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/mavanepurodisapame.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/baxix.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/fazezebaxubedodowar.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/98529503375.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a49c94240d---38198971700.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/pavomipipinaje.pdfIn PDF document text
    • http://hoaphathotel.com/luutru/files/kapozu.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210916083829.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/91862732682.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/65661807976.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/rinivotajuluroluxixumulek.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ijuramem.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_off0000b340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB340 11108 bytes
SHA-256: 55f07cd9a99c33c477aeca2c909bfb96963c290ab903c9cf3d7003f66ae4e6e6
font_01_sfnt_off0000cd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE551 16260 bytes
SHA-256: a2f69120ab43fed50088ddaf50a75dda5d42e7f4132689c99542a895e23bf285

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