Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ad5baf4fd86603…

MALICIOUS

PDF

83.8 KB Created: 2021-03-18 01:10:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 84376ed60dfa4093675a31eb28fddc55 SHA-1: 91749cf476d4775f02cb76ea757477c277fffaf3 SHA-256: a2ad5baf4fd86603c9bf4a9c21827abf4c48a5937620541f296ceec18335cff2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9994

Heuristics 5

  • 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.
  • 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://seumenha.ru/wix?keyword=36.+the+industrial+revolution+crossword+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452154/normal_603a234ff0a87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393791/normal_5ff10576532c8.pdfIn PDF document text
    • https://cdn.sqhk.co/pogadidotilu/fbjejd4/mega_man_4_mobile.pdfIn PDF document text
    • http://gonalotuturopil.mywebcommunity.org/84899697149.pdfIn PDF document text
    • http://dazolovegom.mygamesonline.org/dexebotanu.pdfIn PDF document text
    • https://gumomerad.weebly.com/uploads/1/3/1/8/131856086/kawimutexifapawek.pdfIn PDF document text
    • http://vuvajujuli.mygamesonline.org/circulatory_system_project.pdfIn PDF document text
    • http://rozewevojalel.sportsontheweb.net/94721050587.pdfIn PDF document text
    • https://purubagenipobeb.weebly.com/uploads/1/3/1/3/131398544/3f8d2914f6a.pdfIn PDF document text
    • https://jodemugibinid.weebly.com/uploads/1/3/5/3/135347277/3d762f.pdfIn PDF document text
    • https://cdn.sqhk.co/lekabadixi/jnj0zfm/13130337672.pdfIn PDF document text
    • http://bitalotava.scienceontheweb.net/pretty_little_liars_season_6_episode_1_free_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405895/normal_5ff9f51c10508.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476127/normal_5fe495e3a27eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419644/normal_5fceb49ade23d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/campbell_hausfeld_pressure_washer_pw1350_manual.pdfIn PDF document text
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_5cb733175f93460bbc30d61219566ad6.pdf?index=trueIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_099d4181d06a475b89ad4b97ac17cc20.pdf?index=trueIn PDF document text
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_3bd04aa73c354002a40f6298ed67b817.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/rupazegofuzija.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/xilisoft_video_converter_ultimate_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/how_to_replace_springs_on_lazy_boy_recliner.pdfIn PDF document text
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_0df0314d13e9464a98f32319aafe8af1.pdf?index=trueIn 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_off0000fd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD89 5432 bytes
SHA-256: 1d4314eeb5fef99ef9b23c6ca4a7b6b9a4502b84c9fa13fd567f64904de9bc6d
font_01_sfnt_off00011011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11011 14736 bytes
SHA-256: e8fdb115c290ae3167f4854e8094e1f1129c04bc0ef6ae10f123479dfb8da907

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