Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b70872b1e3b5c5…

MALICIOUS

PDF

122.7 KB Created: 2021-09-19 07:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8b9c4da9f7b9468e83eee834f4190534 SHA-1: 41f77c4558504f4caa622884445ea3e0a9ae7891 SHA-256: 82b70872b1e3b5c5c4bbb1e252f9b59b1a8c3ae1bdea55e7e10283821219b5ee
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links to external URLs, many of which are hosted on disposable domains. The heuristic 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or execution of malicious content from these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crewmak.ru/uplcv?utm_term=vba+convert+excel+to+pdf PDF link annotation
    • https://empezo.xyz/js/ckfinder/userfiles/files/vejupukunipanozaxixolutad.pdfIn PDF document text
    • http://glttek.com/userfiles/file/78186397152.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/94003590927.pdfIn PDF document text
    • https://stotex.rs/files/15834655697.pdfIn PDF document text
    • http://live-net.it/file/zazibakezoripasagukifuri.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/ranividefuwateza.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/24053774475.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/laxozopanes.pdfIn PDF document text
    • http://kodemari.info/data/files/33397338232.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/47878027066.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/batan.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/sigubitasejiduxureruduwen.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/janafanafokaro.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614161ca2b4cd---ponapuwaxuxikugetoti.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/rojojerukasimidadomik.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/ketudorur.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/79463461937.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/70119283961.pdfIn PDF document text
    • http://ternovykh.ru/content/file/17519196049.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/2895745564.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/vemiwikomef.pdfIn PDF document text
    • http://bakoca.hu/files/file/ravojatitoxizuri.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/vefav.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/46932922657.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_off000179ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000191c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191C3 10628 bytes
SHA-256: cc9e912084506b3fa644378d27fb738b2db732c5366b62c3166f0bdd3738239c
font_02_sfnt_off0001aa0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA0F 19232 bytes
SHA-256: ecb303274ac21d82ddfe4f458266223559e6ae10e22289659d342bd5eecdd54f