Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f76ea766d02a70…

MALICIOUS

PDF

150.4 KB Created: 2021-03-28 15:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 42c03ffa67a3fe7602edbeae8ff5b965 SHA-1: 1033489762c640411d8a79957989ae3235d5b144 SHA-256: d8f76ea766d02a70cceeea96d7f43b56591d4b7bd9688d5eb5ff7c288c155bb3
166 Risk Score
Tags
free-cdn-ebook-manual-lure

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. It uses a password-protected-archive lure. 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 0.9996

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://kuzutuzo.ru/123?utm_term=clickshare+user+guide PDF link annotation
    • https://cdn.sqhk.co/biposuba/tkgj4E4/megaxogozivoruxu.pdfIn PDF document text
    • https://cdn.sqhk.co/baxoladipezu/9Hycigk/daily_planner_app_for_pc_offline.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanunir/iiUie5D/answer_how_are_you_in_russian.pdfIn PDF document text
    • https://cdn.sqhk.co/furugilenu/Zdgogfn/anime_live_wallpaper_hd_download.pdfIn PDF document text
    • http://kufomabid.mywebcommunity.org/numerical_methods_for_partial_differential_equations_book.pdfIn PDF document text
    • https://cdn.sqhk.co/rusobotakox/ei6ifji/kid_videos_funny_ones.pdfIn PDF document text
    • https://cdn.sqhk.co/zevolazezag/dxe8je2/20405257333.pdfIn PDF document text
    • http://majovevalaji.sportsontheweb.net/97366273133.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/tezofuretejom/90856724595.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/cabarrus_county_fair_entry_forms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ed4b64b-b885-47b7-9bc6-5a26790aafa2/40986146154.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/jiloxowavu.pdfIn PDF document text
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_68a0e6265c0a414f8a35eef3f51a906a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/01401a2c-3b38-42fd-aa98-1c3f874da39f/16323475972.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcee0a04-2189-4b86-bd5f-be7002f5ab94/10856893440.pdfIn PDF document text
    • https://9cfe8934-cc69-4f76-a0d0-2e9849ea4530.filesusr.com/ugd/fd9558_7fa64d8b14e24c1ab7deeb00deab3621.pdf?index=trueIn PDF document text
    • https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_c265addc6da04eb8930ca0e47120a010.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eec529b-af7c-4880-9c50-98501435c84a/43509947541.pdfIn PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_fe610f1620ad47b7980a0e9afd8e3de9.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000196a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196A4 40004 bytes
SHA-256: c94aa331b98c26a9f22af443b64ea9e94d8785d3fc4809ffcecca20480ec7820
font_01_sfnt_off000210a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x210A5 5172 bytes
SHA-256: 6365711a44df4f05e056d3cec5c6259f40bf10d1d55f59c6c2a5934eb3dc8444
font_02_sfnt_off00022232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22232 12912 bytes
SHA-256: 0f1f9b704178d1130d0968fba550f6d2945066aa7c8d965364768d044ce87882

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