Malicious PDF — malware analysis report

Static analysis result for SHA-256 e810e57a7e8ee635…

MALICIOUS

PDF

75.6 KB Created: 2021-03-30 05:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb253493c4e2ebba2fba0fb9d2f18cb4 SHA-1: a81aea78360a0f0db2ab079387fb68c2234e0bb4 SHA-256: e810e57a7e8ee63563df9b77986b084a884e441c7192fc9d3d5fc36a80c225b4
134 Risk Score

Malware Insights

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

The PDF contains multiple external URIs and is flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The presence of numerous links on disposable hosting suggests a link farm designed to obscure the ultimate destination, likely a payload download. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest it's part of a phishing campaign.

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/123?utm_term=english+alphabet+tracing+worksheets+printable
    • http://wojazilasifef.iblogger.org/basics_of_networking_tutorial.pdf
    • https://cdn-cms.f-static.net/uploads/4424328/normal_605f52f3ce65e.pdf
    • https://cdn-cms.f-static.net/uploads/4406216/normal_603f2af51100b.pdf
    • http://sapelijamot.22web.org/2638423566.pdf
    • http://penowuz.22web.org/sebazozeboti.pdf
    • http://giwapozolaleg.mypressonline.com/taylor_swift_fearless_album_download_mp3.pdf
    • http://purepivuposav.iblogger.org/comment_fusionner_deux_fichiers_sur_mac.pdf
    • https://static.s123-cdn-static.com/uploads/4370768/normal_5fcd59ba89b30.pdf
    • http://pedugubugof.mywebcommunity.org/chromosomal_abnormalities.pdf
    • https://cdn-cms.f-static.net/uploads/4375890/normal_604d0152a3496.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/25ee411a-3420-4864-ac93-b0b69f21762b/gmat_prep_book.pdf
    • https://uploads.strikinglycdn.com/files/d1662de0-b34c-4756-8430-745d0740c3bc/kosogipozibijolubi.pdf
    • https://7c8f45b7-e058-4e27-bccd-8ee7dcb26900.filesusr.com/ugd/d5cf39_97bd5fe3cebb4df9ba9c6b9bfc47a88f.pdf?index=true
    • http://nifopufu.epizy.com/22458384704.pdf
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_db82ce3c24e44c31984228fc616a0874.pdf?index=true
    • http://dakafatuvuguviz.atwebpages.com/cold_chain_management_food.pdf
    • https://uploads.strikinglycdn.com/files/d17be065-de54-4706-b70c-f9928cbaaaf9/how_to_play_blackbird_fingerstyle.pdf
    • http://volulel.rf.gd/civ_5_guided_missile_upkeep.pdf
    • https://uploads.strikinglycdn.com/files/27c1c5fa-64e3-4d13-890a-f6b9f28f5171/68662863588.pdf
    • http://xodojes.epizy.com/43884837056.pdf
    • https://71a5d838-4e22-4830-8da1-7955ec3365f5.filesusr.com/ugd/f2f43e_814087fa9bb940719c8066d6c0fdf542.pdf?index=true
    • http://padenijuwike.rf.gd/lavatumiveguxixumaloje.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_off0000ea04.bin
ea1aa606ad0b641af9a0713621bd07d27a16abf05d73cf9e8020e6b0e9f64f87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA04 5448 bytes
font_01_sfnt_off0000fc9f.bin
5be4d784c92fc8d1d1fff5af8029c64f902f3470e1cd6b14576d3de38b157112		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9F 10676 bytes

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