Malicious PDF — malware analysis report

Static analysis result for SHA-256 b194e781982d2e42…

MALICIOUS

PDF

82.6 KB Created: 2021-04-02 19:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b972d8ea439d55830d90de64072dc1c6 SHA-1: 7328625fb3dd3e9b6230ad7aaa8a8dd643f7c75a SHA-256: b194e781982d2e42e841606d9d7353044c38cff14d7a405f35fd541913364f84
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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/strik?utm_term=enochian+english+definition PDF link annotation
    • https://cdn.sqhk.co/pipugisoveku/iay6Mhd/christmas_jazz_piano_sheet_music_free.pdfIn PDF document text
    • https://cdn.sqhk.co/zofagopipowi/4gEgjjf/tulumenomibig.pdfIn PDF document text
    • http://1xbet-regi.site/weider_x_factor_workout_chartp4lim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373782/normal_602216a01a66a.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovipawe/ggjcb3v/world_archery_championships_2019_s-_hertogenbosch.pdfIn PDF document text
    • http://wupevijijoze.mygamesonline.org/ritaxaki.pdfIn PDF document text
    • https://cdn.sqhk.co/dutaxato/zhfjbJ1/wawawekevowowakotatab.pdfIn PDF document text
    • http://keepxufi.space/playmemories_camera_apps_er_for_maci2yu0.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/49506008314.pdfIn PDF document text
    • https://cdn.sqhk.co/felolavap/gdQygjS/pekadovamuje.pdfIn PDF document text
    • http://vevebopawo.mywebcommunity.org/filaboraxizebofas.pdfIn PDF document text
    • http://rentline.pro/adobe_premiere_rush_android_8.1_0_apk_downloadf46br.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422643/normal_605f65e3651f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496602/normal_5fd31d4f0b0d6.pdfIn PDF document text
    • http://stopnutristrike.ru/47320831178mt3u1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a42a99e-ac4d-4f9f-99ab-e73d6faf05fc/nubelekijotakas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c87fd7d-98c6-4648-9a57-4bf3c4746025/st_edwards_state_park_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8484ee03-35b4-47a4-833f-a63286efd8e9/76107975732.pdfIn PDF document text
    • http://vebusatoro.atwebpages.com/nazixezaxezilusesukiweb.pdfIn PDF document text
    • http://roporuti.onlinewebshop.net/jewogapopekefo.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF129 5144 bytes
SHA-256: 91878128c10a96cd97ee945098862132205fb78536104560b2d6cc61fc834130
font_01_sfnt_off000102b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B2 10748 bytes
SHA-256: 337e2f8cebe238427b8762421dc0feb7192e5d21f97540eac2002099b549a778
font_02_sfnt_off00012794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12794 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf

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