Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2ca9c66ad7fc8eb…

MALICIOUS

PDF

85.9 KB Created: 2021-09-14 01:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 58b9b4920986a2dac06190591138b151 SHA-1: cfdd29d7040a2fc41dbd5c2b1077388469a90e4c SHA-256: f2ca9c66ad7fc8eb57ddb7e06f64eb6940ec3701af756de4ff95f5233b92925c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download further payloads or lead to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f00b4abcaf---22581253655.pdf In PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/pajibefofulobufemugi.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/rubejenogeterixotojexufik.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/rugegegawoxoroxeg.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/narilibuv.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/39989619492.pdfIn PDF document text
    • http://totoumi.jp/upload/file/paxodomasazaw.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/7066916863.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/95866608961.pdfIn PDF document text
    • http://sro52.ru/uploads/files/13001832773.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/mezeresi.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/rufevuwupujurixeseponasi.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/19867884159.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89605327618.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109041216213747.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/rijudusabadoxatujapalu.pdfIn PDF document text
    • http://elpijisystem.com/file/duzodi.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/jojomodolunopuzizezavozot.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/58853262157.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/vufetoxi.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/74130506034.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/tabibadapovoxosu.pdfIn PDF document text
    • https://grandegroup.net/files/zakipalolosebenijo.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/bipomotutigifarunimuxozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=dialer+storage+app+androidPDF 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_off0000edfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10612 10568 bytes
SHA-256: 05f10672e17aae6611f318157fd6dfc8666019ef784201861419d44dc0f10bb2
font_02_sfnt_off00011e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0A 17176 bytes
SHA-256: 543ede2573025222c09e101ed9fff26e2cb05ec6885a325c45fec21482c65193