Malicious PDF — malware analysis report

Static analysis result for SHA-256 d07d08233ef96532…

MALICIOUS

PDF

71.5 KB Created: 2021-06-06 08:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 958b16b72aba69e91acbfca66890d428 SHA-1: 176a874882688903357104bcbd44069cacec92bf SHA-256: d07d08233ef965321ab1f90303a523f69fa483daffeabdb0c072ae55f1262166
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://medvor.ru/pbw?utm_term=inch+fraction+to+mm+table PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384167/normal_606adbff1d68f.pdfIn PDF document text
    • https://fasexonepagi.weebly.com/uploads/1/3/0/9/130969542/c8c1199e690.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380214/normal_605158a1e3444.pdfIn PDF document text
    • https://nimateson.weebly.com/uploads/1/3/4/8/134881528/23ef728.pdfIn PDF document text
    • https://tumekisegazuf.weebly.com/uploads/1/3/4/6/134611428/fuwamezidiv.pdfIn PDF document text
    • https://xaperosojemi.weebly.com/uploads/1/3/0/9/130969510/konisanuxaw-sobakakemofepon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500438/normal_5fccc44cd6a76.pdfIn PDF document text
    • https://fapizorimuko.weebly.com/uploads/1/3/1/1/131164308/67b82fb6c5a5eb1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392869/normal_5ff1db3399c98.pdfIn PDF document text
    • https://puzifisabu.weebly.com/uploads/1/3/1/3/131378936/6c564.pdfIn PDF document text
    • https://lijupumo.weebly.com/uploads/1/3/4/4/134496400/rawuvapigeg-vujalitukimav-zonug-baxefe.pdfIn PDF document text
    • https://wesuzijuto.weebly.com/uploads/1/3/0/7/130740493/4c461c09ad3f32a.pdfIn PDF document text
    • https://puzaloraren.weebly.com/uploads/1/3/4/5/134510283/dugoduwuvu.pdfIn PDF document text
    • https://pozopili.weebly.com/uploads/1/3/4/3/134310053/sewakevuw-kikebofadikiv-rozokutox.pdfIn PDF document text
    • https://dewotime.weebly.com/uploads/1/3/1/6/131606762/0b273a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367302/normal_604b382420a04.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lagawiwefe.pbworks.com/f/56481453344.pdfIn PDF document text
    • http://pebegijopolo.pbworks.com/f/recording_programs_for_pc_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c386c79-ec26-4bd0-948e-27a787ed8f75/sedefajovu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76309f3f-e348-4991-991d-a44e3d2ef1eb/rival_electric_food_slicer_blades.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/f/jusupufovusorope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3e98f25-15fb-4165-b199-81e9730a06fe/what_the_bible_says_about_unfaithful_husband.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_off0000db95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB95 5020 bytes
SHA-256: 043d2767f59aff2989fd3f7914f823913318493714ac7c9d2ac89e52de463734
font_01_sfnt_off0000ec83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC83 10580 bytes
SHA-256: cd1ea86a46d7e121a2c3ed0e25aa366fcfa015a13bc396e019c48a4c9ad847e5