Malicious PDF — malware analysis report

Static analysis result for SHA-256 b087e0da27408df1…

MALICIOUS

PDF

92.1 KB Created: 2021-04-20 09:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 269b98a99aafb5d588b5f3a7ecdf1710 SHA-1: 24d5d8cf1c92f10ecaee34f7c15b17eec05d3f5e SHA-256: b087e0da27408df1228509765a601542e50cd09f450a728de114ad8ab5dc49e1
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URIs, many of which point to disposable hosting. The primary external URI identified is 'https://leonvi.ru/strik?utm_term=best+indian+stock+chart+analysis+software', suggesting a phishing or SEO manipulation tactic. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=best+indian+stock+chart+analysis+software PDF link annotation
    • https://cdn.sqhk.co/fijajiles/haVuhdM/sosijusibamab.pdfIn PDF document text
    • https://xufalawat.weebly.com/uploads/1/3/0/8/130814535/546d45abc92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407994/normal_601a3a9d8700c.pdfIn PDF document text
    • https://gunujudota.weebly.com/uploads/1/3/2/3/132303168/a63858e6c5.pdfIn PDF document text
    • https://moxuvobojivoz.weebly.com/uploads/1/3/0/8/130873852/lumoxibukirepe.pdfIn PDF document text
    • https://cdn.sqhk.co/satofurijob/bz5Uiet/angry_gun_super_recoil_kit_we.pdfIn PDF document text
    • https://cdn.sqhk.co/gajeneset/hjjlbji/89692667627.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411921/normal_5fe8f8a5af11b.pdfIn PDF document text
    • https://cdn.sqhk.co/pabopimi/xhczfSu/ninja_throwing_knives_name.pdfIn PDF document text
    • http://wonnaturila.space/graphic_designer_resume_template_2020dkond.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488817/normal_5fcb4c87c26f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479460/normal_60022330784a5.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/xiV6yjd/57669688253.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498978/normal_60265e837055e.pdfIn PDF document text
    • https://cdn.sqhk.co/bebomopakax/jhgnTgj/77825324823.pdfIn PDF document text
    • https://cdn.sqhk.co/kevovevude/chh4zAv/stray_cat_doors_2_walkthrough_stage_1.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://bettyloustintruckbbq.com/how_long_can_baby_sleep_in_graco_pack_n_playakidf.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/4896bd7d-c10d-420f-9687-44a3eb624b48/repairable_cars_for_sale_in_indiana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e632964b-735f-48a2-aa5e-fb0bef39adfa/bafuge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0bbe3c2-df27-4e0a-babe-e45364103520/unix_shell_script_command_line_arguments.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_off0001270c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270C 5416 bytes
SHA-256: 392e8d9ac105379b87615d0248e98f14504c7af8cb5e554e91f9b37c21e0b97b
font_01_sfnt_off00013991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13991 12376 bytes
SHA-256: a0682c46f607f5174ab2a56f58d928e58d9c9eca947f72a2a6dcc111a2b6653c