Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3a1b49e6dfb270c…

MALICIOUS

PDF

77.3 KB Created: 2021-03-22 15:58:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52f56e449a939996db59c905c827f66a SHA-1: 259266e630e7b462d900513c89eb733902dc6ec9 SHA-256: d3a1b49e6dfb270c97f4d898188fcf2733a61b5d0d0f831c47b85ba38584eb4e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains a large number of external links, suggesting it's part of a link farm designed to direct users to potentially malicious websites. One of the primary URLs extracted is https://mezovuduw.ru/wix?keyword=nightjohn+pdf+free, which appears to be a lure for free PDF downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/wix?keyword=nightjohn+pdf+free
    • https://kekugijofer.weebly.com/uploads/1/3/5/3/135321092/bajuzufevawo-pejokokilupipof.pdf
    • https://cdn.sqhk.co/kamozipu/highiNx/kimar.pdf
    • https://cdn.sqhk.co/vujagefamig/aPg2Njf/41990100779.pdf
    • https://cdn.sqhk.co/lenalibuz/jpiaEhb/mabimupatariziwusezu.pdf
    • https://votaxejasusax.weebly.com/uploads/1/3/0/9/130969278/toxiz.pdf
    • https://jawifeguviweti.weebly.com/uploads/1/3/2/3/132302916/nugiwasojupibejugabu.pdf
    • https://cdn.sqhk.co/vefemenivu/dghPJZw/sirumoxexefur.pdf
    • https://cdn.sqhk.co/suxavawudomo/h6wOhDY/word_online_no_login.pdf
    • https://cdn.sqhk.co/dojozafo/gct3ggk/luke_combs_youtube_unreleased_songs.pdf
    • https://najonetawo.weebly.com/uploads/1/3/4/5/134522785/3818084.pdf
    • https://lolizafopig.weebly.com/uploads/1/3/1/4/131453679/1101947.pdf
    • https://cdn.sqhk.co/julubesaf/ajgijXP/mini_zombie_games.pdf
    • https://cdn.sqhk.co/dabebasavus/Wiajgyi/zombi_granny_scary_adventure_horror_mod_download.pdf
    • https://cdn.sqhk.co/xovujiroveg/hj0ijhi/cyber_hunter_hacks.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rizujatevozax.rf.gd/how_to_get_apple_airprint.pdf
    • http://sewadereweben.epizy.com/how_to_become_a_better_reader.pdf
    • https://34e2f0dc-0077-42bd-a047-efa2502e92af.filesusr.com/ugd/8a05ec_00b1f169beaf4eb3bb67e532404be792.pdf?index=true
    • https://7211abc3-b26e-437e-abd8-8a8c7ebd4af5.filesusr.com/ugd/0683fb_d3c3e03a8731413c8c5cd5a3ba1cf55f.pdf?index=true
    • http://nedafab.rf.gd/nupixoruzin.pdf
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_9b4b3e09dca54a6eb95c1781710e2b59.pdf?index=true
    • http://kutoduno.rf.gd/sezopopademidote.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f227.bin
07ba801dfd4e86db6d138fd759722019db8a84e00f16609de9ec52299bbd22ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF227 4928 bytes
font_01_sfnt_off000102f8.bin
e62b76657cea4056ae8ed31cce615aa1dea265062c92c4d5a43d2f51e60cc914		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102F8 10896 bytes

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