Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e79180094280685…

MALICIOUS

PDF

81.6 KB Created: 2021-09-11 05:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 0833deea7c65b13c1627b332797e379c SHA-1: 25a2ec707351c8e9ec117cab76885c3bc2d79ee2 SHA-256: 4e79180094280685b8088d7a57c69b4a52dc113e4cce59cbd6ebdbea5bab2df4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is part of a link farm designed to host numerous PDFs, likely for phishing or malware distribution. The embedded URLs point to various domains hosting PDF files, reinforcing the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/71911352034.pdf In PDF document text
    • http://fullerton.kopanramen.com/uploads/files/3128506780.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/50247860417.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/savoneju.pdfIn PDF document text
    • https://ksboutlet.com/file/files/4024106075.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/96224229226.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/lepawibajoteke.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/guruvoz.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/90992320761.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/52380948996.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/23288802369.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109070137255293.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/rilosunulokurawiwa.pdfIn PDF document text
    • http://lepal.sk/ckfinder/userfiles/files/lurexamovopetiv.pdfIn PDF document text
    • https://alexspa.pl/userfiles/file/pukunavadis.pdfIn PDF document text
    • https://frisch.ro/files/file/77270135274.pdfIn PDF document text
    • https://blugarden.eu/file/53636364930.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/rufelavawubejevovejiva.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/didetoxejiwu.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/44770999038.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/zonagazubuzatev.pdfIn PDF document text
    • http://trivio.it/userfiles/files/71651955781.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/feputefoxidiwogasol.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/nikop.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/mibetaregetokomarabipik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=app+toy+apk+free+minecraftPDF 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_off0000de28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63F 10616 bytes
SHA-256: fb0805b6bd5e4b72aa100fe423f97720b0a3fea2ff59569afaae85f073bf6cb3
font_02_sfnt_off00010e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E94 16404 bytes
SHA-256: b87177bae6fa437cc1bf9a196b6bddabd218a69e80b69ea4420293480620ef52

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