Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55320e8b12a0b78…

MALICIOUS

PDF

125.6 KB Created: 2021-05-31 05:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f146c08a43c91571b2c59b3c6aed4e31 SHA-1: 2f5aa870c6b49978c9c764b6cb8a244cee9e45ec SHA-256: b55320e8b12a0b7894b8a22118692ca788ab5c13dc96f15eabfe7f0bd12b1b94
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or malicious content delivery attempt. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic to distribute malicious content. The primary malicious URL identified is https://leonvi.ru/strik?utm_term=tyre+recycling+process+pdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=tyre+recycling+process+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408485/normal_6030a1b15b1c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421201/normal_602650ca100c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421612/normal_6049dfbc02ed0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419451/normal_602224ae21ca8.pdfIn PDF document text
    • https://kikosizijup.weebly.com/uploads/1/3/1/3/131379594/1674337.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416504/normal_6016d235017a0.pdfIn PDF document text
    • https://xibogunef.weebly.com/uploads/1/3/1/3/131398295/lalavenisiw.pdfIn PDF document text
    • https://lasasozizo.weebly.com/uploads/1/3/4/0/134041343/3661362.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477369/normal_60048a087b4f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459163/normal_5fcc754f4bfd2.pdfIn PDF document text
    • https://tafebitekule.weebly.com/uploads/1/3/0/7/130776603/ralijitofide.pdfIn PDF document text
    • https://ponokexagetax.weebly.com/uploads/1/3/4/3/134326843/feda2d40a4165.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465545/normal_605c9a198d517.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424692/normal_60217b1dc2036.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/f12309ae-30e0-4d15-89db-8d5d3e6ca3d0/gukonoxidatom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9891eec9-509b-4ff1-9767-b56b98debc1f/fedex_tracking_id_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2af3d16f-a633-4980-ba65-a8814137e215/effet_de_texte_du_ballon_photoshop_tuto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d87166f7-2a01-42ed-8533-90196d94082b/can_sex_offenders_go_to_state_parks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01038450-8873-492b-bfd0-f8c4ef387326/life_cycle_of_a_tiger_shark.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10f6957d-7f69-4ae2-8c1f-ac90e6b22fb2/fundamental_of_electrical_engineering_exam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d22f8dae-61d2-48a7-8ea9-af650e22580a/kekodilufemib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d278979d-fca7-4710-b014-5bf0d290ac05/anarkali_malayalam_movie_dvd_washington_post.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48fd08a3-8423-4daa-ab66-55c3217ad548/how_to_take_apart_a_delonghi_air_conditioner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8b42217-5113-4b44-ae89-da1ff721383d/89284474485.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_off0001ae1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE1F 5164 bytes
SHA-256: de7a3b509f4e0b97374bbbfbdce9f1dd3e81f84e3528aaa3395b99b39602ef16
font_01_sfnt_off0001bfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BFD2 12028 bytes
SHA-256: 29cb071265d49c356809e4582bb9ffb7aedc0181f4c0d1d055faa94f95f48c1f

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