Malicious PDF — malware analysis report

Static analysis result for SHA-256 b637020891e5ae25…

MALICIOUS

PDF

73.0 KB Created: 2021-03-16 00:23:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 90c5f97bc42637825530fa553e69512c SHA-1: 1c9354c68366421f750e0c9e2a197964cf4e808f SHA-256: b637020891e5ae256eac74a2a2078bdf054da56067ffc9adf2097cd4deead7e9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm on disposable hosting. ClamAV and ML classifiers identify it as malicious, specifically a phishing or trojan variant. While no scripts were extracted, the structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://vilenefex.ru/wix?keyword=mclaren+oakland+internal+medicine+residency PDF link annotation
    • https://cdn.sqhk.co/muxigatatini/fShh5jh/meme_generator_free_download_for_windows_10.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/gejumulowag.pdfIn PDF document text
    • http://murimubijejaba.mygamesonline.org/sonitikedopibe.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/sarololab.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/how_to_use_plantronics_voyager_legend_bluetooth_headset.pdfIn PDF document text
    • http://xalapuzim.sportsontheweb.net/lean_bulking_diet_plan.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/XiiogeW/56855371482.pdfIn PDF document text
    • http://fevinoreniwelik.sportsontheweb.net/2001_subaru_outback_engine_oil.pdfIn PDF document text
    • http://viniveba.mywebcommunity.org/76252615958.pdfIn PDF document text
    • https://cdn.sqhk.co/vukixukafoga/iTia8jd/alman_dili_luget.pdfIn PDF document text
    • https://cdn.sqhk.co/wixadigizal/gdieidZ/53699976100.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lovetijif/campbell_hausfeld_mig_flux_80_welder_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c28140a-f4d9-4c26-9188-db9dd60c0f76/93246542675.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3eded6c-9595-465f-b3bd-91326ca37112/iris_blue_light_software_reviews.pdfIn PDF document text
    • https://16564176-4c62-44d7-82e3-1dea6b832d73.filesusr.com/ugd/5e57cf_82202c9d1fa645ef88483c21ee2d4c56.pdf?index=trueIn PDF document text
    • http://tofujuwo.onlinewebshop.net/historia_de_mexico_despues_de_la_independencia.pdfIn PDF document text
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_062724bf514f4ac9a5affe875ab82842.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/76cb47c5-61ca-4e63-b067-3b2d999556cb/how_to_change_the_battery_in_a_g_shock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a964647c-12a1-4758-94da-a89540ca276d/best_free_dwg_viewer_software.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/3_point_likert_scale_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/fikopedexoreko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21ffa45d-521e-4775-a97d-1c74fea7cba5/howls_moving_castle_book_three.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_off0000de98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE98 5256 bytes
SHA-256: 953bbfd675c9b2b3b32afe5541039b9476a46f97be17fc1d775d496aa1b3da41
font_01_sfnt_off0000f075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF075 10436 bytes
SHA-256: ac707bf64fe1048cb8a6fb8e20491267f78cb5fefb89cd3576005d266f821c0c

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