Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a1b13de6ff66ac…

MALICIOUS

PDF

84.8 KB Created: 2021-09-08 20:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 97f5f0c87338ec3728a4a4fb19bc9ab6 SHA-1: 722942aacfd7f49ab9ff6adbf2e7c0bf272f4a1c SHA-256: 99a1b13de6ff66ac12bd35d59bda0e62ff0b542287a3c483e7bbf21423dbca90
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting a phishing or malware distribution lure. The PDF structure and the presence of external links indicate an attempt to redirect the user to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://omatsuri.kr/data/userfiles/files/15515525169.pdf In PDF document text
    • http://babamoleskine.com/files/file/datoselilaxojuxejewosoxa.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rabuxopavoruwi.pdfIn PDF document text
    • https://aqualibramontois.be/fckdownload/file/21731224362.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/xexivisujimitapopep.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/noxina.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/fiziguweragizu.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16133a7c64b655---39071790400.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/61414906567.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2109031030300592208zglgu.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/cf7b220f3bcd86d7e30f70357604501c.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/pojoxaribowiv.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/mijasajagujewapinig.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/wokuju.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/58815750887.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/kewemebaz.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/mexisagesododogo.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/35ef9a044233e8948a7cc3ca2755e1b0/ritoguwifo.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/nufaredi.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/webetijasedixum.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/rukazumuvawo.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/jowesobetesilujedakumuker.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/defumonemes.pdfIn PDF document text
    • https://cubic.is/userfiles/file/50984771528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=hedging+strategies+using+options+pdfPDF 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_off0000e620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE620 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE37 10720 bytes
SHA-256: 15725f1b29bbfc5b09ca00552e1cfe0d19055306efc7fbc6585024dd31a48482
font_02_sfnt_off000116af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AF 17916 bytes
SHA-256: 3f4e648b5592d7097ecaa44a976f9fa8725863ba8ee40821825816a54a0ab23a