Malicious PDF — malware analysis report

Static analysis result for SHA-256 658c1375e614b5ef…

MALICIOUS

PDF

85.8 KB Created: 2021-03-08 10:57:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fecf043af2653136a904c9bb8f52074b SHA-1: 4394c3e164f053554f6d7547eacc6147f84c9cbf SHA-256: 658c1375e614b5eff671541da3009fb6c6f11212d385b01226a87150d22b784b
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary focus on a link related to a common TV issue, suggesting a phishing or malware lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, further supporting a malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://pelibifir.ru/wb?keyword=my%20samsung%20tv%20has%20no%20picture%20or%20sound PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479454/normal_6038243291e05.pdfIn PDF document text
    • https://janodiwuzujemux.weebly.com/uploads/1/3/1/3/131382133/1d9e2d8953bea7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451049/normal_60347f38d417d.pdfIn PDF document text
    • https://dokarugosili.weebly.com/uploads/1/3/4/3/134362608/f6201f7fc747.pdfIn PDF document text
    • http://mitatizizuje.mypressonline.com/fosizuf.pdfIn PDF document text
    • http://rigoditibalun.mywebcommunity.org/t_fal_optigrill_customer_service.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427094/normal_604412b8aecbc.pdfIn PDF document text
    • https://bobidowi.weebly.com/uploads/1/3/2/7/132740787/70dd0e1e.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/wobipiwim.pdfIn PDF document text
    • http://mamefumiwuto.mywebcommunity.org/55234046824.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480393/normal_5fd6768a0285c.pdfIn PDF document text
    • https://direwuberegenis.weebly.com/uploads/1/3/4/3/134361890/1bfafee52a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485942/normal_60237df44198a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/55986cc9-270b-4d55-8d8a-4bdf61d16827/how_big_does_a_tv_stand_need_to_be_for_a_55_inch_tv.pdfIn PDF document text
    • https://c8d0f166-86fd-441b-8df5-aa5e6c6c7644.filesusr.com/ugd/f4b3af_152cca7d87c24ac685487c053542c5ad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f11cb9dd-f16c-46e2-b6dc-fd71dd307a91/41496939448.pdfIn PDF document text
    • https://dd907c4b-492b-4b4d-bf3c-9f0b7a2bd2c7.filesusr.com/ugd/96a426_ce1ed922160a4afca2dcf71e04a46324.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zurovajij/wexewa.pdfIn PDF document text
    • http://gixarewujedel.atwebpages.com/memories_malayalam_movie_script.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/wukiz.pdfIn PDF document text
    • https://f7e05ffc-afae-4d19-be15-7e9c659e5e5f.filesusr.com/ugd/72f62b_405f8383e3b240deb1da88814931df8f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ffb7231-aab4-478e-a2bc-9c7866602182/madulutubitilata.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/kia_cerato_2013_1._6_manual_consumo.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/barnum_and_bailey_circus_performers.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/linasakukipo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc79f0bf-0f2a-49a6-a6e4-a7c9119dd29b/volume_and_surface_area_of_cuboids_worksheet_tes.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_off00011029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11029 5620 bytes
SHA-256: a1ad247d534742ba39367a70adbc27869bd96c64c6817faa5fc0b9e3cfeb5cd8
font_01_sfnt_off0001233a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233A 11216 bytes
SHA-256: 5c35bfe992c625790e4f4337d4790bdb1bb63ad819af76fd51bc7bdd895c0e46