Malicious PDF — malware analysis report

Static analysis result for SHA-256 4392b4764e50fa70…

MALICIOUS

PDF

67.0 KB Created: 2020-12-20 07:51:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d915d0f0af0c90e561d8fdfe4c1a8c2f SHA-1: c32f05bc46e86e8c3bd9a3ed245f579e21231eba SHA-256: 4392b4764e50fa706850dbdff150cd53b22962bd51343313e906b93d5449f1c6
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 detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it's part of a link farm designed to redirect users to potentially malicious sites. The document body, though heavily obfuscated, contains references to 'wire wrapping crystals diy', likely a lure to attract victims.

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://traffnew.ru/123?utm_term=wire+wrapping+crystals+diy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4502567/normal_5fbb65a75fa8c.pdfIn PDF document text
    • https://varowuzogan.weebly.com/uploads/1/3/1/8/131856285/siler.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375708/normal_5f9143e8938f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499023/normal_5fd97d462cf32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5f874d58db44d.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/mawaniginojas-katonezuvizuwij-lupixire.pdfIn PDF document text
    • https://daxuregivav.weebly.com/uploads/1/3/4/4/134431970/a69976de5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446942/normal_5fb8bd033df2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422884/normal_5fb8a8ee8f7ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448733/normal_5fc8c8ff5fb23.pdfIn PDF document text
    • https://dawemewi.weebly.com/uploads/1/3/4/7/134747996/fubetuvuwatavij_wolozivar_silireneno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369328/normal_5f8c7b7cdb205.pdfIn PDF document text
    • https://lejomibis.weebly.com/uploads/1/3/4/6/134657815/4525500.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fc7a10c10d6a92a736d2eaf/t/5fd741029264095525ef5758/1607942405303/tofupawosajari.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD56 5124 bytes
SHA-256: 482237c2cca64373cc2a4602e357f9418563f83db9403f9352ee44b47a1d0602
font_01_sfnt_off0000cee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE1 10000 bytes
SHA-256: a1c858e0ab4437b2043a8abc263fd2f018cb2fadccbd36939c2f350c20d5cde3
font_02_sfnt_off0000f11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11B 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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