Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d97f862b1786ca7…

MALICIOUS

PDF

77.3 KB Created: 2021-03-15 20:19:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83c9503d02c879bd2ed077cadb17b403 SHA-1: baaa31e58d29a5513137a13bd59357d8b26b49ae SHA-256: 5d97f862b1786ca7678d720d79a3c30ed8d39dcf4c1bb9e300846f1e55754edb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The PDF contains a large number of external links, many pointing to S3 buckets and other benign-looking domains, but also includes a suspicious URL 'https://botokaw.ru/wix?keyword=francis+scott+key+elementary'. This suggests a link farm or phishing attempt designed to redirect users to malicious content. No scripts were extracted, but the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/wix?keyword=francis+scott+key+elementary
    • http://wopizup.mypressonline.com/wodutametoxofegovibeke.pdf
    • http://tifusavegapawuf.mygamesonline.org/95904962673.pdf
    • http://veruvipavopa.getenjoyment.net/what_happens_to_most_living_things_after_they_die.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/pesetufavo/small_for_android.pdf
    • https://s3.amazonaws.com/patotale/nibisipak.pdf
    • https://uploads.strikinglycdn.com/files/2de0d01e-efc9-4461-88c8-f50ec29e3640/35843411860.pdf
    • https://s3.amazonaws.com/medaliwifufugel/canederli_al_formaggio_alto_adige.pdf
    • https://s3.amazonaws.com/kukupunopedon/kirapajogewadogupabes.pdf
    • https://s3.amazonaws.com/xonobijikivo/badrinath_aur_budhdev_official_game.pdf
    • https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_9096914e2f414f34b1ed2ac2c5604524.pdf?index=true
    • https://s3.amazonaws.com/tujeviwakirawu/bully_apk_obb_2019.pdf
    • https://s3.amazonaws.com/sazomo/employment_application_form_template_free_australia.pdf
    • https://s3.amazonaws.com/gewuwasi/freshly_picked_moccasins_size_guide.pdf
    • https://s3.amazonaws.com/desekusoxi/gowajujewerokako.pdf
    • https://s3.amazonaws.com/jixerubowi/77990153764.pdf
    • http://miganuvag.myartsonline.com/97542562531.pdf
    • https://uploads.strikinglycdn.com/files/a0bac3b6-8b51-49fd-9290-50549ef5d46b/pretty_little_liars_full_episodes_season_3.pdf
    • https://s3.amazonaws.com/wiwamoxamo/what_are_the_three_types_of_biomes.pdf
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_9bc89ed49d9342828439281bae9c5fd1.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e172.bin
7df8930f613bf33131dba59c62ed027268d8319efe898f79e0f36829e7d0bb58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE172 4856 bytes
font_01_sfnt_off0000f1d6.bin
b23bef2a7a52f274be85f8f5031e6e8f94bc72b9230c420a9059e4280e54b9e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D6 11260 bytes
font_02_sfnt_off0001185b.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1185B 4324 bytes

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