Malicious PDF — malware analysis report

Static analysis result for SHA-256 bab3f79a60f70d1d…

MALICIOUS

PDF

87.8 KB Created: 2021-05-10 19:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a64fe9e09dfbd322df8a5798a75a7020 SHA-1: 288e7e118d43d4736f5702f779ec3b5558fb1f6a SHA-256: bab3f79a60f70d1d7b8878b2280c7b7de44e82c578b23fff6abc6cbd03d489cb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of embedded URLs and the suspicious nature of the linked content point towards a phishing or scam campaign, likely using a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • 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://lozipotod.ru/strik?utm_term=hp+officejet+pro+8500+ac+power+adapter PDF link annotation
    • https://cdn.sqhk.co/kawabewiwof/2hdHqMZ/zeboxep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459481/normal_5ff6a614a0505.pdfIn PDF document text
    • https://cdn.sqhk.co/zunezafi/giaSgeM/68924804640.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwopazeg/hchcnWL/azhage_azhage_tamil_album_video_song.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/EkijHib/ates_ve_su_2014_oyun_skor_oyna.pdfIn PDF document text
    • http://menformula.xyz/6773616261sz06s.pdfIn PDF document text
    • https://cdn.sqhk.co/dodirorip/ihfibgh/temugeparewonega.pdfIn PDF document text
    • http://m-laskin.ru/relative_clauses_exercises_intermediate1m6vm.pdfIn PDF document text
    • http://amin-ukraine.net/after_we_collided_google_driveal9w0.pdfIn PDF document text
    • https://cdn.sqhk.co/xubipoxeguza/jcvjahd/dalobexukubi.pdfIn PDF document text
    • https://cdn.sqhk.co/putuziboki/tmhei8R/lasigekojupoduvat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451206/normal_6041eab9603b9.pdfIn PDF document text
    • https://cdn.sqhk.co/jigitovewuk/0wibhbg/software_update_apple_iphone_6s_plus.pdfIn PDF document text
    • https://cdn.sqhk.co/dufubimaru/jW6X5yG/raposuxatagedukame.pdfIn PDF document text
    • https://cdn.sqhk.co/lixipadiwel/dphaifx/hornblower_series_order_to_read.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://s3.amazonaws.com/teximikamukubo/jepasatimew.pdfIn PDF document text
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_f2b2f11b26d84132af26b132a440e4c6.pdf?index=trueIn PDF document text
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_407908986319446caf16bf802088d59b.pdf?index=trueIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_0ea365510e2f49b6b51b63ef0032b62a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kakef/drivers_ed_online_texas_answers.pdfIn PDF document text
    • https://311919ef-92bb-434b-a93e-382c1a5e2e65.filesusr.com/ugd/c893b4_94febcdd9b154423957353722570426a.pdf?index=trueIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_0f862ebfd95e4e0eb02cddf162500565.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/44534450937.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B36 5212 bytes
SHA-256: f8edc63270eec0395a346b23066dba06ae77291015d1d9313cf5dc9bf57dc1f0
font_01_sfnt_off00011d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1B 11328 bytes
SHA-256: e20e59b33997c2d6d7f691139bd9c6cce4c7d5d4783b4e21d8d47bf56af99152
font_02_sfnt_off000143a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A3 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f