Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4fa1915afc4a8c1…

MALICIOUS

PDF

76.9 KB Created: 2021-09-12 21:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a2544ee8c0a05234fdcdc1a343ba86d7 SHA-1: 1a2fe039cfa97995be47a107fbb7570ca34228f2 SHA-256: f4fa1915afc4a8c1d5fedf83cbc3325605a2dfea4983efe0451b54c3db6b0a98
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URLs, many of which are embedded within the document's structure, suggesting a phishing or redirection scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of linking to multiple distinct hosts, often with UTM parameters, reinforcing the idea of a link farm used for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://pixomot.ru/uplcv?utm_term=a31+vs+redmi+note+10 PDF link annotation
    • https://ventadeterrenosurbanos.com/userfiles/file/61885362029.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/33677552352.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/kafogog.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/vijotos.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/26485531512.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/zabezomesoruvelawu.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/41866649489.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/xuwex.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/gakepodejagemati.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/vatage.pdfIn PDF document text
    • https://alutat.com/data/file/97003336291.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/wosusejomalinetatapuv.pdfIn PDF document text
    • http://foodchemsino.com/d/files/92347924080.pdfIn PDF document text
    • http://dominant.name/userfiles/file/14162150856.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/83318634777.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/12849201528.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/lisubejozajaxirekovisu.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/57682418819.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/4180634049.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/sanukopofele.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/makekuxugideloxusatelilo.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210906_5DA7CCCE72B6D504.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/92850949706.pdfIn PDF document text
    • https://hiroyoung.com/data/files/jamutizadi.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/59535864745.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_off0000c467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC467 10596 bytes
SHA-256: c099c00a0575aeaf75d91fb9675824ab367af8c8fea7a2c48b3b012b0d9bce82
font_01_sfnt_off0000dcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAF 18880 bytes
SHA-256: 7f8ff92bd660e29cd2eb6e167ea9bfb18f91521c6d86d96bd654305208be2650
font_02_sfnt_off00010e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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