Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ec94a8edb899a2…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 21:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: cd10af0f97d7aad4966c3a67652c0917 SHA-1: ac922fc20a9e2c05ea69f54b21581a0f4a39faf6 SHA-256: c1ec94a8edb899a2c627e645b254e5e25fc1aa90a97e4289a55a054ffbdd1f42
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The presence of external URIs and the overall structure suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://infrive.ru/uplcv?utm_term=document+writing+app+for+android PDF link annotation
    • http://avesta-hmora.boj.se/uploads/userfiles/files/donapepazasisinabikosetir.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/zupejexarekoxezer.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613488f77e00c---gunugoli.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/rexegozoxelepikoke.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/veliweromotisaga.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/86476546995.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49384418296.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/vefudiviketowofimutove.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/31909754456.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/susutijavelawadodozemevi.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/dizumadib.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/75300684122.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-10/20210910082529193908.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/vorepetupuzamaxijoloj.pdfIn PDF document text
    • http://lovesenergy.com/file/57008147561.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b37429f388---fiwamesefupamatame.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/69582878078.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/dinipabeminewoxufosubuli.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/fasifotogote.pdfIn PDF document text
    • http://chieucoingason.vn/files/retixirusigajamuramovuzot.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/5505280446.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/36315173785.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/50614271492.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/zuxan.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/mibekisisitufevevuretozak.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_off0000b11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC931 15312 bytes
SHA-256: adb12ff8a60b55f4418fafc521a29636669f482cc0d3a9bf5e4929887f3843e1
font_02_sfnt_off0000ef38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF38 10936 bytes
SHA-256: c53697a4b3960eb1d9c38f8e5c78f2fff6d07ca42456ad147541f2507332a466