Malicious PDF — malware analysis report

Static analysis result for SHA-256 f02904d2f2112bd5…

MALICIOUS

PDF

77.2 KB Created: 2021-06-11 08:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 285d46fff6079ce10bb13e64e224fa65 SHA-1: bdd6856cd309b88f565bd2f8acbc24aad93065fb SHA-256: f02904d2f2112bd58988e5813955e57c3f8cd3cc6f47c53c72cb545ddd4467aa
186 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 external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to educational content, likely to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://smidgel.ru/pbw?utm_term=worksheet+on+simple+and+compound+sentences PDF link annotation
    • https://sisebixa.weebly.com/uploads/1/3/4/6/134625325/gipuxif.pdfIn PDF document text
    • https://xepezexitig.weebly.com/uploads/1/3/0/9/130969834/vudulumatu-rovuzuxusurun-woxusoso-nudenimeni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480414/normal_604cdf002a105.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368478/normal_5fef168c6cf5e.pdfIn PDF document text
    • https://ketodoligas.weebly.com/uploads/1/3/4/3/134384615/sosenaniredagesuzeg.pdfIn PDF document text
    • https://rinixupikexem.weebly.com/uploads/1/3/4/0/134096042/sijuzuwupawit_ruziwozixira_sezudovom.pdfIn PDF document text
    • https://zipobirin.weebly.com/uploads/1/3/5/3/135386694/bb116051dcbb.pdfIn PDF document text
    • https://losujawidejope.weebly.com/uploads/1/3/4/3/134310111/e986e2f07695c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418579/normal_6066b2ff16858.pdfIn PDF document text
    • https://tebozelekunoton.weebly.com/uploads/1/3/1/4/131453588/e3a3d4958a66f.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://uploads.strikinglycdn.com/files/b32d827a-aaf8-4863-9bc3-3f9f62da4516/how_to_check_transmission_fluid_in_2004_vw_beetle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bdc1741-0fe6-4cfd-9a7d-e0547adc257f/how_to_fix_pressure_washer_gun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba653780-a1df-4e05-bdc4-03a24bb37e56/34129413712.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5cc8df9-9d96-4dfe-8537-a13b90883e1e/barcode_scanning_app_free_download.pdfIn PDF document text
    • http://gipomebepate.pbworks.com/w/file/fetch/144454152/rosarovisadosipitufapuvi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c0acfb5-f67b-4355-b030-b3d07ade4ae5/how_to_use_a_manual_hydraulic_pipe_bender.pdfIn PDF document text
    • http://zikupuzajix.pbworks.com/f/frames_of_mind_the_theory_of_multiple_intelligences_by_howard_gardner.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/f/2996538715.pdfIn PDF document text
    • http://sodopateduke.pbworks.com/f/69204089220.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_off0000e2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F6 5272 bytes
SHA-256: b8a5f17e677704e1e7c327a20647e35ec655710aaed1be56a5dff9fd0c2b7032
font_01_sfnt_off0000f4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B9 10764 bytes
SHA-256: e414b0b0c202ff8800e0b334f20aee9df7b52720722800f965e77b5ebb4a2f96
font_02_sfnt_off0001196c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333