Malicious PDF — malware analysis report

Static analysis result for SHA-256 836f5c77bb8aacd4…

MALICIOUS

PDF

85.8 KB Created: 2021-03-26 08:29:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 28792d911724fc1010d01e926c25c956 SHA-1: 8a0519fe49f83da67d622a405efc0598cf39488b SHA-256: 836f5c77bb8aacd4cdebc985673a8f698051757bd212bab05c9867ca49d70da2
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 0.9996

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://fokemale.ru/strik?utm_term=fudge+a+mania+chapter+12+summary PDF link annotation
    • https://cdn.sqhk.co/ludozenidi/seKiihe/shooting_range_sniper_target_shooting_games_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418362/normal_6002d81080d21.pdfIn PDF document text
    • https://cdn.sqhk.co/fakameratexe/hgihicA/wow_vanilla_warlock_dps_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/wolebiduju/ogcCteI/hyperdrive_star_wars_quote.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476294/normal_5fd6722ddab24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424011/normal_6004aa4cb41cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393362/normal_60249b320d68c.pdfIn PDF document text
    • https://vadutebo.weebly.com/uploads/1/3/4/8/134889136/revesovut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466680/normal_5ff83c549bb9b.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/wowufonibub.pdfIn PDF document text
    • https://cdn.sqhk.co/xiladuxe/if3jgif/airmen_selection_test_sample_paper.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/5013fe76-1f74-4af9-836b-d65f33d7985a/computer_animation_programs_for_high_school_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/466d0c2b-f2f1-4814-9b8a-03c03a03362c/kindergarten_workbooks_in_spanish.pdfIn PDF document text
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_e62e88d8939e4726ba7fe35a63103690.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d201d2bd-c99f-43ea-afcd-0d90ee399bfa/how_to_use_a_traeger_timberline_1300.pdfIn PDF document text
    • https://7605d98d-8b17-4a41-9383-f5c8d5af9bcc.filesusr.com/ugd/2bed4c_ff86fbf9286d4b0a8e9f2e5d0d2f1d0d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cb80431-3f0d-4e3d-92fa-a9cddb3a1172/finger_maze_printable.pdfIn PDF document text
    • https://c140f178-ee45-427e-91fe-a3c5f821f67e.filesusr.com/ugd/ebc5f9_32693176f97449ae8aaff26ed42333df.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/savifin/how_to_reprogram_a_clicker.pdfIn PDF document text
    • https://981168d4-05fc-44b6-871d-73371d7e8cf1.filesusr.com/ugd/87d215_485d110c6cf34ee09bc594ae27c1f748.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/liwara/what_is_a_2009_bmw_328i_worth.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5D 5696 bytes
SHA-256: 851512de18ce9e1685f60344e77ab1017367d3677a78038a15601c7272578400
font_01_sfnt_off000120a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A1 11876 bytes
SHA-256: b56163f8fa133cb315688f5b6e65a027a84d19cf903906e28c192319e599ad82

Open this report in the interactive analyzer, or submit your own file for analysis.