Malicious PDF — malware analysis report

Static analysis result for SHA-256 da546b06a1645b49…

MALICIOUS

PDF

69.8 KB Created: 2020-12-20 05:41:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ac9a2f850faf8c0197250b83a2debc79 SHA-1: 9067c8581b443e936e01ecac307bfd78626cf14a SHA-256: da546b06a1645b49d89790b7dfc37464cd59b674fc0cbdc69e9fc1d86f7aa542
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The presence of external URIs and the overall structure strongly suggest the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/strik?utm_term=reading+fluency+benchmarks PDF link annotation
    • https://jixatazibasuv.weebly.com/uploads/1/3/4/4/134402985/junofawojim-gulukako.pdfIn PDF document text
    • https://pesasujax.weebly.com/uploads/1/3/4/8/134882000/864e46e58200d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382779/normal_5fd08abebbfa6.pdfIn PDF document text
    • https://jabuvevakeg.weebly.com/uploads/1/3/4/6/134685488/4485961.pdfIn PDF document text
    • https://funogumoduwe.weebly.com/uploads/1/3/4/3/134309977/5e701d9c0ab.pdfIn PDF document text
    • https://xirovule.weebly.com/uploads/1/3/4/7/134749068/mujadesif.pdfIn PDF document text
    • https://jakilirimilibev.weebly.com/uploads/1/3/4/8/134862861/4926062.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366652/normal_5f96f2ac82273.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/nigimul/bulking_workout_routine.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc58f90b8467722f1f3741f/t/5fc99856e262c015945bc49c/1607047255091/solar_system_for_kids-_colouring_pages.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0291e5a6-9572-4c20-976e-67d5c2b3c24b/13533024070.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_off0000d272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD272 5748 bytes
SHA-256: e7b72d1ecff69621308b55f670ef528d94432c1b9650bc72dffdb48e59c2b662
font_01_sfnt_off0000e5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EF 10676 bytes
SHA-256: 211d7ede18b5be4c1810ee65c861d58ca57086e8968149e2965ccf2e814fc735

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