Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ff7a654383a4c2…

MALICIOUS

PDF

86.2 KB Created: 2021-02-26 10:44:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f082cc589da1aaf992099ffcfaa71bd5 SHA-1: 4bfde2584a4bfb39e56fd6016063d8033ddd4f00 SHA-256: 16ff7a654383a4c294fa334a5592350a0c8e6a574a8ef84e7077ca0faa244622
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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. The document contains numerous embedded URLs, with one prominent URL pointing to 'ponafet.ru', suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates that the PDF is designed to host multiple links on disposable domains, reinforcing the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/award?keyword=how+to+add+reviews+on+wix+website PDF link annotation
    • http://tazasimeli.22web.org/xozisijeronipod.pdfIn PDF document text
    • http://dakisemakegag.sportsontheweb.net/bokuzosevuwiti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371023/normal_5fe3a10f106bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485704/normal_5fe0ec2b3751e.pdfIn PDF document text
    • https://cdn.sqhk.co/tamenotu/hprjbsV/13436518135.pdfIn PDF document text
    • https://cdn.sqhk.co/lokuwanij/IjgPicH/21865785153.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455376/normal_6004978b347de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495686/normal_602510da4fe94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453902/normal_601b293d85202.pdfIn PDF document text
    • https://kevafesituwa.weebly.com/uploads/1/3/4/0/134040773/7774461.pdfIn PDF document text
    • https://cdn.sqhk.co/fanekizesedi/jMJ2iiE/6319077598.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuvusujalujule.epizy.com/emerson_6kva_ups_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/lonely_planet_paris_guide_book.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/5_love_languages_test_for_workplace.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/dna_phenol_chloroform_extraction_protocol.pdfIn PDF document text
    • http://fevojofutowi.epizy.com/18795436302.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_off000116b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B2 5108 bytes
SHA-256: 0764e69a68a8596ca43fb7543ff78ac549e74526d826f51b02b2176dd6e1bd2e
font_01_sfnt_off00012834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12834 10408 bytes
SHA-256: 6a436ca76c81b76784fd54a60fb0453f56d217541a5581620b28aa9af0b65268

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