Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f37d56155a00e2a…

MALICIOUS

PDF

84.4 KB Created: 2021-03-14 09:02:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8b0746ce764882b1903e5d8d4bc082db SHA-1: ca33a999519d93eafa1446e68916f695cad12de7 SHA-256: 6f37d56155a00e2acc77f4d287414fabc33e86cae8bb66985d11d4947b9fbb61
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 0.9992

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://dafemum.ru/wix?keyword=agen+kolar+actor PDF link annotation
    • https://cdn.sqhk.co/wojipezusax/8nEsVij/25931933339.pdfIn PDF document text
    • http://dojemop.mywebcommunity.org/mbti_types_tv_characters.pdfIn PDF document text
    • http://svoydvalend.xyz/temple_run_2_game_play_app_downloado7on0.pdfIn PDF document text
    • https://cdn.sqhk.co/dugubupa/fMgcajh/endangered_animals_worksheet.pdfIn PDF document text
    • http://kejoxemubogese.mywebcommunity.org/stock_market_news_channel.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/things_to_draw_easy_step_by_step_cute.pdfIn PDF document text
    • http://summ-ita.space/popular_piano_sheet_musicpm7wp.pdfIn PDF document text
    • http://f13x.xyz/history_of_western_philosophy_summary4kqxs.pdfIn PDF document text
    • http://nutusugeralinet.mypressonline.com/22780344668.pdfIn PDF document text
    • http://strapslap.online/25340088435h350s.pdfIn PDF document text
    • http://fresh-ita.fun/tewopijinafubedupoxopul2sy.pdfIn PDF document text
    • https://cdn.sqhk.co/gubogezemazo/aijijpm/dragons_riders_of_berk_cheats.pdfIn PDF document text
    • http://glasshookahcatering.com/fesujujumibawew6w6ez.pdfIn PDF document text
    • https://cdn.sqhk.co/pisomuma/dgekrjg/88140255122.pdfIn PDF document text
    • https://cdn.sqhk.co/rexixugepir/ZBztgjG/correction_brevet_maths_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0de86160-a37e-47ea-a266-952cf9c2b057/35999562478.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49625085-7b34-4b71-bf32-fb80e543b565/16109741596.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4beb9b54-c94a-4084-acff-30448d191d6e/wigejapipebupebim.pdfIn PDF document text
    • http://tebuwawezizafes.onlinewebshop.net/fl_studio_tutorial_software_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14eb85a5-524b-4824-9195-45ebed86b91e/kuzawubiwitedinexuzoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41a60f89-164b-4578-9838-ceadf696b1a3/how_to_learn_kali_linux_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4aed672-ca28-4442-9d16-05a2864ffe36/the_thief_story_mcq_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ba8ab26-b6ca-45ad-a005-d08174b12f0a/object_oriented_analysis_and_design_text_book.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C7 4580 bytes
SHA-256: 92adb99e45fce74bef1095d3ad40635dfe87898309b580289eda0a822a1cc0a2
font_01_sfnt_off00011263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11263 10860 bytes
SHA-256: 8cd9b0ec9b9722a6ded8a844b42176b580bafb73c1046051d09e74e6158ca069
font_02_sfnt_off00013747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13747 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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