Malicious PDF — malware analysis report

Static analysis result for SHA-256 37605a2653c8d6ae…

MALICIOUS

PDF

93.3 KB Created: 2021-02-28 12:49:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7c4cb715594d26b403cbfbbc409f084d SHA-1: 20098a667c9bb5d8b74f114e5838b00d16b8a91d SHA-256: 37605a2653c8d6ae3536530483ee0302181fd43dd6d8ba700586c9e5f1558a48
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://midufefew.ru/strik?utm_term=triangle+angle+sum+worksheet+answers+pdf PDF link annotation
    • http://goproits.com/spoken_english_notes6bkc0.pdfIn PDF document text
    • https://cdn.sqhk.co/pubabolab/ihGOigw/873176738.pdfIn PDF document text
    • https://koloputumoti.weebly.com/uploads/1/3/4/8/134887370/2989f288ff078.pdfIn PDF document text
    • https://nisivijuwowog.weebly.com/uploads/1/3/0/8/130813757/barejigonitipu.pdfIn PDF document text
    • https://cdn.sqhk.co/wevamerazo/cJPgjiR/merolo.pdfIn PDF document text
    • http://pressit.space/how_do_you_get_a_salesperson_license_in_californiaz3k31.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/Gjfidhi/voltage_drop_definition_easy.pdfIn PDF document text
    • http://hesap-al-sat.com/62194032382uls4z.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/oGhiWct/87133338666.pdfIn PDF document text
    • http://sberpodarok2020.online/552693387152nspz.pdfIn PDF document text
    • https://cdn.sqhk.co/gasariba/4v5hgid/gangstar_rio_city_of_saints_apk_mod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454300/normal_6004e8a56f907.pdfIn PDF document text
    • https://cdn.sqhk.co/kifavubivelo/mgehAgh/lofura.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383695/normal_602ab336d6e49.pdfIn PDF document text
    • https://gukikaxut.weebly.com/uploads/1/3/0/7/130775725/4388722.pdfIn PDF document text
    • https://cdn.sqhk.co/zejegure/xBgcagj/42265048146.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/ragejufa/xudolilig.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/briggs_and_stratton_vanguard_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/cheats_gta_san_andreas_playstation_2.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/stuffed_cabbage_nutritional_information.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/99520725031.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_off00011753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11753 5560 bytes
SHA-256: a3121a8ae58aa9013784c0378160fc282a3b7ff3e88579919739b3ab9a424bfe
font_01_sfnt_off00012a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A24 11912 bytes
SHA-256: 4a9021e4ce1ca7238533b0f47ce222bf7ccf0fdc0d8005dca31992a90bba0823
font_02_sfnt_off0001523c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1523C 16072 bytes
SHA-256: 4ce97752c8d1ed0b0302a1507788019c6b738cc3ee96ca273f61f92c287db7cd

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