Malicious PDF — malware analysis report

Static analysis result for SHA-256 98671e5b756d9604…

MALICIOUS

PDF

77.7 KB Created: 2021-03-28 08:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 127181df29399e061cdbe40d8e44ed59 SHA-1: 9a2e8dc7c91171039efb577332e0ed833ec91a1c SHA-256: 98671e5b756d9604dc04f1b2a15cbc58dca3e6cf526fcb34fc5097e5d84226e5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO poisoning campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to exploit users by directing them to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://fokemale.ru/strik?utm_term=how+do+you+say+climate+and+weather+in+spanish PDF link annotation
    • https://kazofinuso.weebly.com/uploads/1/3/4/3/134369681/lagepokufunebov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372707/normal_5fcf43bbaa7fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457006/normal_60157acfb12d6.pdfIn PDF document text
    • https://dapemoko.weebly.com/uploads/1/3/4/6/134647299/nugowo.pdfIn PDF document text
    • https://fuwefepitebu.weebly.com/uploads/1/3/4/7/134709748/venurekuxofojimut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476015/normal_5ff771a313e3e.pdfIn PDF document text
    • https://webuwexuzebonal.weebly.com/uploads/1/3/0/7/130775053/zomifesovet_boxusos_rivaba.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/f0d04ac2-69e1-4d72-95d6-908d3d74c3fb/halloween_pe_games_with_no_equipment.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/ulcerative_colitis_management_nice_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad227c05-64e2-4af8-bd8b-79e5d06389d4/remove_icloud_activation_lock_without_password_apple_watch.pdfIn PDF document text
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_9cf5a4aa6b7d484eaa3925cd9e4cabdd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pipaneku/xulanipulutafinuvuzopita.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/how_to_animal_crossing_pocket_camp.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/65678600429.pdfIn PDF document text
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_a9bf955b5a6a4e7b9906185387204002.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dofufiri/29769354041.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/shayari_photo_video_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/478e0f88-960a-4b66-ba46-7596aa67becd/93396472224.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/nogob.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/tinkers_construct_beginners_guide.pdfIn PDF document text
    • https://cc603790-e41b-456e-9848-d053b607cad6.filesusr.com/ugd/389793_e64b4c1d8af74deabc6b2708a5b70751.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/messenger_apk_older_version.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_off0000f10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10B 5468 bytes
SHA-256: e64951017d7bbec588ce3843c61a4d54f3efa6d51837da89e3cde5b03ae5c36e
font_01_sfnt_off0001038b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038B 11340 bytes
SHA-256: dda1a73b6a069068915944ad38eec57c0bdca34226a533d85d26380d989b5533

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