Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d236a2c7f0dfe2…

MALICIOUS

PDF

84.0 KB Created: 2021-10-05 03:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0fe3f711b8ac2320b28b54ad28193477 SHA-1: 2c5e6f7cf216badee4196aec399b1fba3a47569a SHA-256: c4d236a2c7f0dfe2bd940da817d4371c397c1c1940855563ba9f7f3647cd2ccb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on potentially untrusted sites. No scripts were extracted, but the overall structure and heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://eminencesolutions.in/resources/userfiles/file/15094945029.pdf In PDF document text
    • http://dilimkebab.com/userfiles/file/10954785613.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/52015262220.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/77215086473.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/vokizoz.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/40403641471.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/68761765444.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/zezaxisaf.pdfIn PDF document text
    • http://mayjack.com/upload/files/32270807855.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/mobakiz.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/576275519.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/pupafe.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/zepomuturugovigevesi.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/vufaxekibopigan.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/40584093201.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/30520548870.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/14613384480.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/romid.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/pinaxemutojavom.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/838b7b006be6359069e3abbb89c12f1a/jumuwimananigusirikenu.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/gogelubefigerusesizene.pdfIn PDF document text
    • https://polytex.de/sites/default/files/29943985111.pdfIn PDF document text
    • http://schokofontaene.de/idata/delamibojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=icd+code+for+dry+skinPDF 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_off0000e255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE255 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6C 10320 bytes
SHA-256: 4e7eb1c6d1f17e75f2f1512464c43cf1bc8600af2c32ccc7d9fef4fd08759a65
font_02_sfnt_off000111d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D0 18840 bytes
SHA-256: de6f5ab7893822adef22a8940f7f7f820a2cf72b6998b66b93906170183cb790

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