Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e27f5c0c035e6b5…

MALICIOUS

PDF

80.0 KB Created: 2021-09-17 12:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ddc23f94a71a13c8f97ff00b2e47231f SHA-1: 988c01dff80e96020a4946676b1a80a010d2251d SHA-256: 8e27f5c0c035e6b5c04111164443f53907cb665892e0237a06db68d653d3912e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs, many of which point to unknown or potentially malicious domains, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://sitarasign.ir/data/file/wirubibavebepunelusone.pdf In PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/jigupojukenosus.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/4822155871.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/dubiwujoxuwo.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16140082c91a1b---namelabafakex.pdfIn PDF document text
    • http://dc-3ed4d7413bdb.prshots.de/uploads/userfiles/1630823701/files/getenokewujulotixivuw.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/93435828877.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/derojilaninutewa.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/lafitexitumare.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/cb7d85ade27ebf41f83da2b80e8c0b00/77320975888.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/jiwuvonojagiri.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/93050025195.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/xorof.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/12430878661.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/dovubut.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-17/20210917165255359529.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/kesosojatixefoze.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/jamisavidulelojuvodusuzu.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/71207281221.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210913005418449.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/zanitarajoxosinuwile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=nba+2k+playgrounds+android+apkPDF 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_off0000d3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0A 17620 bytes
SHA-256: c11ff0c6ee78fdf485ef75d34a2f6ac92315e9806a0b6a72d3900114787c9015
font_02_sfnt_off000119f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F7 10880 bytes
SHA-256: 71560870c7855cd203c554aee7687b27fbb99986496e6eaa513963d0962264cd

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