Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf2ac2443e865f0…

MALICIOUS

PDF

70.0 KB Created: 2021-03-11 23:55:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a8605d627dcf23fd212010ea3052f328 SHA-1: a7544bc7d7264bcdd636984dc0d78351b3b2a3a0 SHA-256: caf2ac2443e865f06aee8e512090fc6f3612447c57232e06089e08701370ec3b
184 Risk Score

Malware Insights

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

This PDF file contains multiple embedded URLs, with one specifically pointing to a known malicious redirector. The heuristic firings indicate the PDF is designed as a link farm on disposable hosting, aiming to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/strik?utm_term=download+%2526+install+my+focusrite+scarlett+solo+driver+manually In PDF document text
    • http://nokojatagi.mywebcommunity.org/aliments_pour_baisser_le_cholestrol.pdfIn PDF document text
    • http://tepoparupomo.medianewsonline.com/the_mind_diet_includes_plenty_of_quizlet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454672/normal_604396f889170.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373004/normal_5ffc4bbc3918d.pdfIn PDF document text
    • http://setofexperience.site/craftsman_4x36_belt_disc_sander_partschio5.pdfIn PDF document text
    • http://nutristrike-shop.ru/apc_back-ups_550_battery_be550gy1wea.pdfIn PDF document text
    • http://nositadox.mypressonline.com/all_my_sons_litcharts.pdfIn PDF document text
    • http://digitalmicroteter.xyz/kekovisamoxolofuke1owi5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465557/normal_60269c6d3b08e.pdfIn PDF document text
    • http://atomyimperial.ru/how_to_do_surface_area_of_3d_shapeso6as4.pdfIn PDF document text
    • https://cdn.sqhk.co/rasetiwulipu/beChXJa/70931903080.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/9675264275.pdfIn PDF document text
    • https://cdn.sqhk.co/definuseju/28H1xJT/bubble_puzzle_hit_the_bubble_free_game.pdfIn PDF document text
    • http://sks-expertiza.ru/harry_potter_and_the_philosophers_stone_book_original_cover0spqf.pdfIn PDF document text
    • https://cdn.sqhk.co/vovusupa/CjhkEji/all_creatures_great_and_small_cast_episode_5.pdfIn PDF document text
    • http://lijonotogi.scienceontheweb.net/10045818146.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467561/normal_604300c914bcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445534/normal_6038d08ebb2c7.pdfIn PDF document text
    • http://bitoxifa.sportsontheweb.net/fifty_shades_freed_soundtrack_mp3_download_zip.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/37fb1a04-82e6-4c81-b18c-662883b876f7/lang_leav_quotes_about_writing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af47b83b-4f1c-42c5-ba1a-da12328c694b/how_much_oil_does_an_8.3_cummins_hold.pdfIn PDF document text
    • http://tobikinos.onlinewebshop.net/campbell_biology_chapter_17.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b96fc7b4-48cd-4b8f-b284-ce08dcb5726f/slouching_towards_bethlehem_themes.pdfIn PDF document text
    • http://kozogasivufi.myartsonline.com/91861241644.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_off0000cb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0F 4172 bytes
SHA-256: 392b295253f330fc7d194356d418a35cb583ce59b9adeb69a99dfa9bb6b32d5c
font_01_sfnt_off0000d93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93A 10444 bytes
SHA-256: 24d414d391e6799da29e8717792d8eab6e7b7ea07be2aa8e163c030a4a46f545
font_02_sfnt_off0000fcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCA 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176