Malicious PDF — malware analysis report

Static analysis result for SHA-256 87bfb9b5de0faa1a…

MALICIOUS

PDF

70.6 KB Created: 2021-09-12 07:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ccbcd3e4976e08916fc3246d5cdc98a8 SHA-1: 4820ab07a0e4a39ff7c65964738fb87ad8a0fd31 SHA-256: 87bfb9b5de0faa1a87752070cd6b961aada734f7d5a856ea5d60919259db556e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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 http://cuacuonanbinh.com/userfiles/file/86949457591.pdf In PDF document text
    • http://xedaphcm.com/luutru/files/48640170645.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/62396986098.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/gewepapojokozotu.pdfIn PDF document text
    • http://idcla.net/upload/files/47438711298.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/vamagupexadurenutosew.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/78412432338.pdfIn PDF document text
    • https://kiptep.ru/file/tevaw.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/dawiwonimur.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/43850692126.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/37349538450.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/78035610985.pdfIn PDF document text
    • http://ipllaser.in/uploads/13983682256.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/28172826452.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/memejag.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/32556567767.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347c1267097---wobazo.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/xedizixazukat.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/pusabelon.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/28546865620.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/pebubedunanavakezolujusez.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131af59e81f6---kaluruxedowivilexalu.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/89361031225.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/397593926.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/wujurepadonekogixezog.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/864019838.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/ruxerosokarumitop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=modern+sniper+modPDF 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_off0000b3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC15 10240 bytes
SHA-256: 20664269ed0f8067867914d81e25d8f3e3dadb6ef0de60b4f753009379523dd8
font_02_sfnt_off0000e2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F7 16984 bytes
SHA-256: 43343a0c48f241df3df62397ccc3bd1c4351333000b6e8e62c6a7cfb8dd590ad

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