Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d56d63555a2909…

MALICIOUS

PDF

90.5 KB Created: 2021-03-23 13:52:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9c758100fae3236ef5530c61acb52a9c SHA-1: 2eb1003b139c875cdb39d7e83d6fe18a2a4cd160 SHA-256: 93d56d63555a29090b9fab6607b1d40da4f9a0e135ba3ee4d248638ccc24f369
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious websites. The primary malicious URL identified is https://midufefew.ru/strik?utm_term=portable+shark+steam+cleaner+model+sc+505+manual. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

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://midufefew.ru/strik?utm_term=portable+shark+steam+cleaner+model+sc+505+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4414864/normal_5ffcf133019cb.pdfIn PDF document text
    • http://fisujerekuvij.getenjoyment.net/what_does_spectrum_code_s0900_mean.pdfIn PDF document text
    • https://vuwuzujos.weebly.com/uploads/1/3/2/7/132712237/e22a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369794/normal_604200d1c9c17.pdfIn PDF document text
    • http://xofajenakimexo.iblogger.org/building_construction_illustrated_5th_edition_free.pdfIn PDF document text
    • https://rujumimipadud.weebly.com/uploads/1/3/0/8/130874091/2f32c7c117f91c.pdfIn PDF document text
    • https://dulebolipema.weebly.com/uploads/1/3/5/9/135997598/3c66b05768.pdfIn PDF document text
    • http://jibakerutev.mypressonline.com/spring_batch_tutorial_download.pdfIn PDF document text
    • https://zutuvolesem.weebly.com/uploads/1/3/0/7/130775525/c9ef728b049.pdfIn PDF document text
    • https://lelewamopubexab.weebly.com/uploads/1/3/4/3/134324934/a30022e47ee.pdfIn PDF document text
    • https://wupizesave.weebly.com/uploads/1/3/4/5/134581048/zekufifax.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/cambridge_english_pronouncing_dictionary_17th_edition.pdfIn PDF document text
    • https://jabuvevakeg.weebly.com/uploads/1/3/4/6/134685488/daberig.pdfIn PDF document text
    • https://xevibobi.weebly.com/uploads/1/3/4/6/134683071/f329861e09f31c9.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/d8865858-71a9-49bc-b621-d3bc0f98fee4/can_you_play_ps4_games_on_vita_anywhere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8936e258-a60b-488d-b40d-88d5acea22e5/how_to_sketch_using_pencil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eb6ac16-b050-42c9-9d7f-2562e0dcd973/bissell_little_green_proheat_turbo_brush_instruction_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/327a8395-f382-4ef3-9d33-b0ebd54d81d7/98597778609.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_off0001219d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219D 5652 bytes
SHA-256: 3d445b66e67c2b18e46cd75fb75ba9c18f223441c1e9d26f6ccb5ec26a90a50f
font_01_sfnt_off000134a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A2 11764 bytes
SHA-256: 2b5fcdb124e8ce9e20698e744cbc28e34c6f7a8eb16231e0bc7ae070875b3c60

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