Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0aeb0abd3cca0ba…

MALICIOUS

PDF

74.8 KB Created: 2021-09-18 03:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e167cef21012988536e8ce0bcbaf13ce SHA-1: 3e1676dad9bc1b53388bcd6adda6773b744be921 SHA-256: a0aeb0abd3cca0badf3f2770f688b0555b5cc876e3fd69260f494746b1cdb608
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript and multiple external URIs, many of which point to disposable hosting and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript and external links suggest an attempt to exploit vulnerabilities or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://philabc.ru/uplcv?utm_term=temple+run+app+download+apk PDF link annotation
    • http://carrasvilla.es/uploads/files/nataxifetabefukosi.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/tavizifibatelijewuzaziwo.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/medusewelawaw.pdfIn PDF document text
    • http://slovoveri.org/userfiles/zununifetikoko.pdfIn PDF document text
    • https://drlanda.hu/user/file/pivutakagaxoxudawamumuf.pdfIn PDF document text
    • https://eliteprotectiveservices.net/ckfinder/userfiles/files/mufufomajiniruzozisodaper.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/mufovupewasoguxasike.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/49368818655.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/2018975966.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/86951378168.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/xokexijuduviborafiwiteb.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16132efc0f3032---vejiwozafukasak.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/52054563290.pdfIn PDF document text
    • http://kgmda.com/upload/files/13069670086.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/kefexogumegenovevuke.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/34019055268.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/nujofalezexivubopoxe.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/wofalilopinede.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/34805908152.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/lojasekuf.pdfIn PDF document text
    • https://majubesar.net/contents/files/zomesavasaketejukasafip.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/27953523499.pdfIn PDF document text
    • http://schubert-hh.de/image/file/64919288033.pdfIn PDF document text
    • https://mediaskills.rs/files/kolajotodawoxoti.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_off0000c18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18A 10436 bytes
SHA-256: f9ca9e169fb2fdb35bff31c9d111405b772307d72ad75a3cf103073c024a2e8a
font_01_sfnt_off0000d92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92D 17104 bytes
SHA-256: 8297cd00314682bed0840fbb6a8d0be4091e781342393479f3ea9af6a9a282cd
font_02_sfnt_off0001055f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1