Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f6bfeb94c81b1f5…

MALICIOUS

PDF

78.5 KB Created: 2021-03-15 10:22:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: cb910dee26f3f944b7f458e1ceb67b8c SHA-1: d1b9ad14c8b2114a34c6d44076ad7d6c371ad41e SHA-256: 9f6bfeb94c81b1f5221f74d8b7a8d9fe073938dd8652d4adefcc13601ca43dd3
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded links pointing to various domains, suggesting it functions as a link farm designed to redirect users to potentially harmful websites. The presence of a redirector link further supports this, as it likely leads to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=idioms+adages+and+proverbs+worksheets+4th+grade In PDF document text
    • https://cdn.sqhk.co/buzovegom/1WO6qib/5338546485.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443821/normal_601c5fa7ccdb6.pdfIn PDF document text
    • https://cdn.sqhk.co/simikitivo/jdv0Qjj/xopapapa.pdfIn PDF document text
    • https://cdn.sqhk.co/rajemaramiw/iiyiijf/zombie_frontier_2_hack_mod_apk_download.pdfIn PDF document text
    • http://filmera.ru/6918336355l1dbq.pdfIn PDF document text
    • https://semirenuzunep.weebly.com/uploads/1/3/5/3/135325284/kuxebo-butanogo-kopikatewoti-watex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470524/normal_60279124ce62b.pdfIn PDF document text
    • https://sidedelozamuk.weebly.com/uploads/1/3/1/4/131482822/b241cd4d1ef313.pdfIn PDF document text
    • https://megogira.weebly.com/uploads/1/3/4/5/134590171/8f068606a97b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481663/normal_6028122e8b859.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476936/normal_60087352b29d9.pdfIn PDF document text
    • https://xokefinodoju.weebly.com/uploads/1/3/5/3/135316617/wagasasipew.pdfIn PDF document text
    • https://cdn.sqhk.co/revikokelobu/JjhpaPa/find_my_phone_number_location_for_free.pdfIn PDF document text
    • http://mscredit.info/kutigasemozedunexenejo0c02.pdfIn PDF document text
    • https://fulojexerewo.weebly.com/uploads/1/3/5/3/135345176/pawifuxojofamov_wijaru_mezijipogu.pdfIn PDF document text
    • http://jigikujed.scienceontheweb.net/3_day_full_body_workout_routine_for_beginners.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368746/normal_603d7bc06c619.pdfIn PDF document text
    • https://cdn.sqhk.co/padixemugex/nhbjiYw/earl_of_sandwich_full_montagu_nutrition.pdfIn PDF document text
    • http://zixaxagewan.mypressonline.com/64894756180.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://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_af40e8db93f24c358107e9cc65905637.pdf?index=trueIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_aac5cfa8f2d444f3ab51a70e81fa7d9c.pdf?index=trueIn PDF document text
    • https://6bfd3344-23d3-4e03-ab7d-00c1c23eecf6.filesusr.com/ugd/be19e1_5343909bdffd4e67af9b09012f8716d6.pdf?index=trueIn PDF document text
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_e9793bcd47fb452699874c96f5aa9a9d.pdf?index=trueIn 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_off0000e56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56C 5508 bytes
SHA-256: f9dcaa21d5d3e7209fa4a477071be1f3c037f67d0501dc0f6f0ff8b825730405
font_01_sfnt_off0000f80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80A 11036 bytes
SHA-256: 1114819fa549cb966164524eb2e0308113e4900f77d96b7ed772e4d39ca5d33c
font_02_sfnt_off00011de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE2 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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