Malicious PDF — malware analysis report

Static analysis result for SHA-256 a59d22e5da5de748…

MALICIOUS

PDF

74.2 KB Created: 2021-09-19 14:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c6fbf080302244c3a6325a4627432113 SHA-1: 4960f3ed2cffdf524ee376fce873547e0b1e2065 SHA-256: a59d22e5da5de74816c6fd0954eec118b35773e52a1ee8530a1200f9b8269123
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of many similar PDF URLs suggest a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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 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://krisoc.ru/uplcv?utm_term=smart+tv+app+download+apk PDF link annotation
    • http://aci-immobilier-douai.fr/userfiles/files/20374957533.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/zibowugutenefeju.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/96782569176.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/65667699163.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210919081840.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/25323181030.pdfIn PDF document text
    • http://wami.cc/data/files/monajozaf.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/92083349402.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/39082039990.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/zanoxogoje.pdfIn PDF document text
    • http://maidichike.com/upload/files/davirafipozex.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/gibukumozapekidijofuxev.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/68038622772.pdfIn PDF document text
    • https://cowik.pl/upload/dawolupisesutevadeda.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/35405855398.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/dupoxelo.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/tenizakivugezon.pdfIn PDF document text
    • http://retailcop.ca/files/sonekoxerexutejunuwemajob.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/89448720255.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/80322563104.pdfIn PDF document text
    • http://rcot.by/pics/files/vawetunipabosisogadafar.pdfIn PDF document text
    • http://esejsc.com/upload/files/semevupudusoje.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090512465673499.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/95821387882.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/pevaberekokexovugikoxe.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_off0000c198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC198 10480 bytes
SHA-256: 6df89c9358900c0ab8caf8db58a793d35ffc8e3396c68a7599d7cb0e3b08d5f7
font_01_sfnt_off0000d962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD962 16372 bytes
SHA-256: f0edd8cff657333fefea41fab9401fb6a15551e915c7091c1aceaf2928d70eee
font_02_sfnt_off00010390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10390 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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