Malicious PDF — malware analysis report

Static analysis result for SHA-256 36c8ada3493ccde9…

MALICIOUS

PDF

78.7 KB Created: 2021-05-06 09:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 02e43dbd2be138608760c17435312d57 SHA-1: d9b2d71596be5defeee57081ffb6e038dbe422fc SHA-256: 36c8ada3493ccde91720f916eb576ba33add7041c5e51d5eb90c5b27a4c61d16
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dugedepap.ru/strik?utm_term=vista+50p+user+manual PDF link annotation
    • https://nukusuruv.weebly.com/uploads/1/3/1/8/131857442/1e187.pdfIn PDF document text
    • http://ravevuzovije.mywebcommunity.org/92764820781.pdfIn PDF document text
    • https://norofuzalugegok.weebly.com/uploads/1/3/4/8/134882219/xekom.pdfIn PDF document text
    • https://mapunexi.weebly.com/uploads/1/3/3/9/133999872/buletomezoxidaxida.pdfIn PDF document text
    • https://cdn.sqhk.co/jorevagu/ktA3qmD/topuwek.pdfIn PDF document text
    • https://tizemafuniture.weebly.com/uploads/1/3/4/6/134636649/miliragijoluwo.pdfIn PDF document text
    • https://cdn.sqhk.co/xekejegixawo/2hdhbSj/wigixogewewinezuxab.pdfIn PDF document text
    • https://cdn.sqhk.co/bepeguvovori/EEjcuFv/gofabiwadelexo.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/egdM9gf/46269178452.pdfIn PDF document text
    • http://pararapameso.getenjoyment.net/getting_started_with_spring_framework_book_download.pdfIn PDF document text
    • https://kazirevuteguzug.weebly.com/uploads/1/3/2/6/132681824/tebodoworemuxawux.pdfIn PDF document text
    • https://cdn.sqhk.co/nasubivapu/vziezie/meditation_music_video_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_b442e915ef4540dcb87293226f51efd5.pdf?index=trueIn PDF document text
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_1c54248b19084af3b56cfe714e166e32.pdf?index=trueIn PDF document text
    • http://tikimiwuwal.myartsonline.com/bncc_mec.pdfIn PDF document text
    • https://1b15a19f-c8c2-4d9d-8c2f-e97aa7ecfe2c.filesusr.com/ugd/eb6c48_22db272ef96649a081e6ce0bf0145847.pdf?index=trueIn PDF document text
    • https://f39f7cea-6337-46de-af4f-699959e6db0a.filesusr.com/ugd/004672_7586093a045446b2a6f9fa994cd367b5.pdf?index=trueIn PDF document text
    • https://781b76d0-895c-4d4e-90f3-491762fad171.filesusr.com/ugd/894952_6a5b69d835cd48c1bbc3ec8e262dce88.pdf?index=trueIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_bae76d3687334a0c941bfd8e80bb2585.pdf?index=trueIn PDF document text
    • https://f856bbc4-01c8-45e4-8891-a53c5ee59fd0.filesusr.com/ugd/8e827e_19dcc3b9ee2741f1a4968f19d1461d29.pdf?index=trueIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_9051373e6038421cb42e4e0a36234a57.pdf?index=trueIn PDF document text
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_8114e79440f0491b8156947722885f0a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dorulusof/kevegekot.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/paxivawivuxatapos.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF638 5196 bytes
SHA-256: 456aca090bebba64d463ab89b063f6b013df5d4e50ce21c82b55168b46a46a74
font_01_sfnt_off000107d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D0 10984 bytes
SHA-256: ba765fdf8935831f69271cc2383e346e78202f5024bc2a28050db801d6f5629e