Malicious PDF — malware analysis report

Static analysis result for SHA-256 bed3bf033a52a29c…

MALICIOUS

PDF

68.5 KB Created: 2021-02-28 14:07:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 711531d6210a95e606bbbbca9fe7ed5f SHA-1: a6e12f78e1c596e19193469b8926193c0bd3efe8 SHA-256: bed3bf033a52a29c7434e34adc0fa5242a27a5b4bde63dbafa32b3f81ed82345
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/award?keyword=fitbit+versa+lite+bands+australia PDF link annotation
    • https://bebefezagogu.weebly.com/uploads/1/3/4/3/134372182/521232.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454425/normal_6007ac5f850c6.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/id2QPWz/75078164683.pdfIn PDF document text
    • http://naturalik.fun/metal_radio_online_usazjv3x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470679/normal_601f973c50e87.pdfIn PDF document text
    • https://barofabilis.weebly.com/uploads/1/3/2/7/132712093/eabaedf7ffe30b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422893/normal_603b33c373812.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481676/normal_6024c507adb10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416792/normal_6008756bbf6af.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/the_entertainer_song_in_movies.pdfIn PDF document text
    • http://moreprodukti.com/tecplot_data_file_formatyxjg2.pdfIn PDF document text
    • http://a-trvl.ru/formal_dresses_for_black_tie_weddingqipw9.pdfIn PDF document text
    • http://akmurzina.com/badami_bhutanatha_temple_informationxrb8v.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/MjbXghf/u_mobile_top_up_rm50.pdfIn PDF document text
    • http://zazorin.scienceontheweb.net/is_fifth_third_bank_open_on_columbus_day.pdfIn PDF document text
    • http://leledup.mypressonline.com/kopajumasamebenedejiwax.pdfIn PDF document text
    • http://alifan.store/jack_and_the_beanstalk_story1a9hw.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
    • 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_off0000c270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC270 4744 bytes
SHA-256: 5f07fd17d8c6a8241e1abdce5c2012d46b1cd35d880bc67e9fa60b361a0c8736
font_01_sfnt_off0000d293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD293 10600 bytes
SHA-256: eeafdc33103306eefcfb6b6f36c8b547580301562f5e4b8915ac6988a27d2508
font_02_sfnt_off0000f6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D4 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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