Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb818261cae8177e…

MALICIOUS

PDF

81.0 KB Created: 2021-09-24 01:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 96f57b22980dd33c496479b319acecbd SHA-1: 2c95e7d9c110845c2caf6870233fbfcd8b432cf8 SHA-256: cb818261cae8177e21f57e8a38608007bceac8713a9647e4e26044a34d6598ec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to potentially malicious websites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=funtouch+os+11+vivo+v15+pro PDF link annotation
    • http://autoscuolemontagna.it/userfiles/files/23031520921.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/76955905223.pdfIn PDF document text
    • http://mqskin.com/luutru/files/44900035603.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac747b05f5---dofuduretosara.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/60713851035.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/3e91994fe107ba0fde70848699096529/tafavinud.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/vixugo.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/32712029893.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/vefolawugukakeperalof.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/48368810131.pdfIn PDF document text
    • http://babamoleskine.com/files/file/pimibasusuvokumajomepiv.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/buxekixavonaw.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/9506820798.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/13263847916.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/jobelobirojofugafuvivogip.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/42387413123.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/dokabugitep.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210911170156728.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/31903628963.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/lobanuragozepebowek.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1631295861_1.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/69485863516.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_off0000d918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD918 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12F 10460 bytes
SHA-256: 7487db8b3eff0c9f5be46257d174997e0d3a2403d9830eef5c6cce940aa70b46
font_02_sfnt_off000108f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F9 17444 bytes
SHA-256: 91fc27e7be2973c9940b7f4aa8c34142ba8548cd4307e513481090155e06cd85

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