Malicious PDF — malware analysis report

Static analysis result for SHA-256 8988f815ceff9401…

MALICIOUS

PDF

73.3 KB Created: 2021-09-11 08:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9a88261db8d90c0b17c7e3fc730ec12e SHA-1: 4c6661fd1e9b61067510ba5c973ddd264b56ee70 SHA-256: 8988f815ceff940190d44b95f4eac403aa80eb26730eb80b33df01d65001be22
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. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a tactic to obscure malicious destinations. While no scripts were extracted, the presence of many external URLs, including one identified as a link farm, points towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://bsinteriordesigner.com/userfiles/files/vulupazewasijisevi.pdf In PDF document text
    • https://hanyauntuktesting.com/contents/files/6131763183.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613969cccb3b5---nefuzojukisajozawajelogup.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/jozipaxafavadobipukavo.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/panerukizikewig.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b50b7eab18---logaxajabepigirixirer.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/36321756433.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/faxokunadokaxapo.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/74970019258.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/joduwolarif.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109062245492250.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/92574907319.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/62466750074.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/55602344507.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/nodolitifonetosu.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/52447340367.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16306262724369.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/noguga.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/60006823247.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/pabuwixejafowubivugudawi.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/popidawarobas.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/taluligupajiwodepami.pdfIn PDF document text
    • http://apothepharma.com/upload/files/gebimutavatogopazozile.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/kukuvifuzojijej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=watch+dragon+ball+z+kai+the+final+chapters+complete+seriesPDF 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_off0000b552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB552 18360 bytes
SHA-256: cc510471aba2b9e18bec351ae765148e29ad682fc702e6bb08af64bc8cbfca6b
font_01_sfnt_off0000e479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE479 11352 bytes
SHA-256: 8c17588379374a4db8208cb322e03b3ab4f71b3942f9e30fe5e91c62f9486745
font_02_sfnt_off0000fea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1