Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aac42ffe4b1de6d…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 04:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fa4cb22dd98072ea95c084455586cf2f SHA-1: af5b4fd4e76cfdb2de94d34bc8bc528ddd1c2e38 SHA-256: 6aac42ffe4b1de6def8170c0cf8c3fef151e4c763e34086e77299d16bb0a1822
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sky1981.com/asset/uploads/files/8034943584.pdf In PDF document text
    • http://hidramaco.com/files/files/wudotizokupufogobaletid.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/ratadejofozuzogidanabew.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/veketofobaxuvifomijik.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/40325009208.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/28171359653.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/joraworekogezesagududonuk.pdfIn PDF document text
    • http://inica.org/files/file///wazukuvotafekolesive.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/jaxipofuwixawukixiwut.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/wutidetuledavavebojamata.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/5627792378.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/9897180113.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/6146559316.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/vezawejunomimuzov.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/37907672561.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/walazozajuvejolebaluduki.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/34483258982.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/wuzaraxopiwetodorimeb.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/33807316995.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/jubalo.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/16401822126.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/manulipudolagujudipuvetuk.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/24045456263.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/f77b0d7490286d11e38dff10771fb319/gukonetunuvewitu.pdfIn PDF document text
    • http://zenkatsu.dk/files/bigedenomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=the+victor+comic+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_off0000df0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0F 17240 bytes
SHA-256: bd9a2f56f04953d85b2d42b266bc53065b7e762dd20764a07eb26610a6c6d8f4
font_01_sfnt_off00010bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123ED 10432 bytes
SHA-256: 7dfdeec7764e7d3a8967778729fe5d99fcd85ee7c3fd6f8c5644dd1e30d56ec4