Malicious PDF — malware analysis report

Static analysis result for SHA-256 29edd9d72e1a6c3b…

MALICIOUS

PDF

75.6 KB Created: 2021-09-17 16:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ff403e52d2f441ce9aadc0407cd77bcc SHA-1: 4d177eb0fd41933a2e7c4720ddc23f314c0a37b4 SHA-256: 29edd9d72e1a6c3b10bc18ede2ebf7808e8821a993e2a74b8d0c9717814ef8d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm hosted on disposable domains, and the PDF_URI heuristic identified an external URI pointing to a suspicious URL. While no scripts were explicitly extracted, the presence of numerous embedded links suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=telegram+hide+chat+with+password PDF link annotation
    • https://aprilboya.com/userfiles/file/21393328145.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/55396755384.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/fodofe.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16137c73f63b2e---74804428879.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/41521724034.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/zoguzotusefulamotewude.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/23009518007.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/5273194790.pdfIn PDF document text
    • https://ikansambel.com/contents/files/loxebunixufunalabugiku.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/38280698021.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/10638029398.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/lutimujazakurujurelipove.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/83601749888.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/garakaxakidalagovewim.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d8a21e78f---wilakitubirax.pdfIn PDF document text
    • https://grandegroup.net/files/gawodogezebijexixesex.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/89149699697.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/govorot.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/30988489140.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/zetejonelafofudalaxuv.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/tageviboteli.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/witagafor.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/dekukokafox.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/towilagawipapitu.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///10426516577.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_off0000c4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F7 10908 bytes
SHA-256: a1fb2741f7491be8d0e691aea7963d20ebae7d91928c1ee5c1fa72471dc05be3
font_01_sfnt_off0000de12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF624 16772 bytes
SHA-256: ba3ddce72f8e967e90c57acf19b523db84d94d4f9fa5330ffb90aa3d3ece59e4