Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d244dc874204a83…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 11:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ae31b12b602266b193f612ea3654a4f5 SHA-1: 2a1db982f53b44040aa8832b99607e78fa7ad663 SHA-256: 9d244dc874204a838cef2f7b911db65f8ea39755c4b15efc43ca5e21d6c9c80f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains or link farms, suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites, likely as part of a spearphishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://miaousland.fr/ckfinder/userfiles/files/56014975882.pdf In PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/98549574381.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcf63d2805---48586563975.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/30275033152.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/sagawakukukedewuwufeg.pdfIn PDF document text
    • http://julianina.de/upload/file/46340649632.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/vokotoragusifevi.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/tokefinekelugobi.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/26972856834.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/97665143563.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/33077318638.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/nomikotevitabunupol.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/manekotafosinixofusefo.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210902124448649.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/95483556510.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/29363507594.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/34161644215.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/pizukojefakunijogiru.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/80482173111.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/bexisadoletepe.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/dikajanolubodude.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/wolopatez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=assassin+creed+ppsspp+downloadPDF link annotation
    • 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_off0000d575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD575 20112 bytes
SHA-256: a99952a0c617549dad8f096ae74c89bc45ee7e46252c0a42bb92b1c3e295f974
font_01_sfnt_off00010956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10956 10476 bytes
SHA-256: 7dc5ed2ca21f0bbe3f83c82a08ab5549fbd285bfece5fbd93a6c8e719bc4f29c
font_02_sfnt_off00012146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12146 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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