Malicious PDF — malware analysis report

Static analysis result for SHA-256 c73e3607f6acf255…

MALICIOUS

PDF

99.8 KB Created: 2020-12-25 00:06:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6eb8b295a31ea84946f3304b6144760c SHA-1: 959ec14d4dd4196c7794b1582ff70febf1ed9342 SHA-256: c73e3607f6acf255e46b36854314965e0ffc5d753a745d09ea9b0178346dac4f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are obfuscated or lead to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution vector, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/strik?utm_term=free+woodworking+plans+download+pdf PDF link annotation
    • https://cdn.sqhk.co/kopizikob/SScBn3p/download_nes_emulator_free.pdfIn PDF document text
    • https://cdn.sqhk.co/kegetaxob/gcQibhj/zeradetojemi.pdfIn PDF document text
    • https://jugubiwujivivej.weebly.com/uploads/1/3/4/3/134352954/8361528.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisuvov/iaI3hdm/cookie_amazing_crush_2020_free_match_blast.pdfIn PDF document text
    • https://jisuzinux.weebly.com/uploads/1/3/4/6/134671095/razixepexi.pdfIn PDF document text
    • https://cdn.sqhk.co/mivesumor/fjasif0/clouds_film_2020_release_date.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xetasif/types_of_armed_conflict.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/791e0f6b-8ea0-49e1-a98c-61a0f59d430b/79570331575.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5a7e1ef-b822-485f-9b18-fb8ad169ac0d/50389059339.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d7b43b1-6899-42ec-af46-e377e8d8d160/synopsis_of_forensic_medicine_by_nar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b98dd33c-381c-444b-855b-ede2476825bb/civil_engineering_pe_exam_reference_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/32547823092.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/android_10_for_samsung_galaxy_s8.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/pomizezeje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7921de13-d3ec-4326-8e9e-ed2d62eb7ea7/best_ccent_study_guide_2018.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_off0001472d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1472D 5320 bytes
SHA-256: 90f582c6e52896a95136be49c022601972169f1a13d9753d3ed9d0ec7981d829
font_01_sfnt_off00015970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15970 12144 bytes
SHA-256: e03e04bf593a42ed661406dc305423305d4786fe0a05d2785de605ceb6348ac2

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