Malicious PDF — malware analysis report

Static analysis result for SHA-256 f286c55f69062d9c…

MALICIOUS

PDF

81.8 KB Created: 2021-09-10 15:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1df834f10e5c8f4541991ca3a91e5902 SHA-1: 4646a907451e31a59e25310544f89c0821e960bb SHA-256: f286c55f69062d9c8fbd6bbf9c9c438c5602a52c35ae789b7b3218208acef9bc
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains and exhibiting characteristics of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://coretry.ru/uplcv?utm_term=how+to+bluetooth+phone+to+firestick PDF link annotation
    • https://wic-net.com/userfiles/file/71109663730.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/30227116408.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/14387793587.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/fetotoji.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/pepusesasomizuzapoxo.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/34679294173.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/sixewid.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/bazajofobuzegemizeged.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/gapawo.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/30780003055.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/depewupotavulol.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/wowemejoravimoneri.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613153c9f3a14---8534726994.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/miluzadikijoxopo.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/64043468874.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613795037b8ef---38269334145.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/66540305182.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/34399589961.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/benibopoto.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/pavisujivupalofuwowa.pdfIn PDF document text
    • http://headrepublic.pl/images/files/naxurusagef.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/nikagubipuwebojumavanovik.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_off0000d744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD744 19044 bytes
SHA-256: 9bd927c58daa9f09b9d4fce1310acc2d6e3082f00c2692bdafda82ff671baf1b
font_01_sfnt_off00010888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10888 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001209f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209F 10824 bytes
SHA-256: 1f671294a4ffe1273e9a2925163e19d4602ab09cf7aad715610df14e504f6a38