Malicious PDF — malware analysis report

Static analysis result for SHA-256 823f6c1616db1c11…

MALICIOUS

PDF

77.6 KB Created: 2021-05-24 00:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ac0fa2ba83673644a0de6e90817c0903 SHA-1: c8a3da4a72610f352f901c6a8a7af4db54c7e6cd SHA-256: 823f6c1616db1c11c5cd1fb2a68460b6587e5c408accb830d100ad1e7d6a1d1b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://golowaki.ru/strik?utm_term=diagrama+de+fases+da+%25C3%25A1gua+pura PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454300/normal_6034223768621.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370266/normal_5ffe9853c3014.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485714/normal_5fde530aa745d.pdfIn PDF document text
    • https://lotefexikig.weebly.com/uploads/1/3/4/0/134097130/be49cd78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379984/normal_6061f5841d380.pdfIn PDF document text
    • https://lapefobok.weebly.com/uploads/1/3/4/6/134663543/tonenemax.pdfIn PDF document text
    • https://zirodamabesad.weebly.com/uploads/1/3/0/7/130740068/watuwik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476007/normal_6062bef51267a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368246/normal_60501763e191e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369768/normal_5fec9065bbad2.pdfIn PDF document text
    • https://mizunilido.weebly.com/uploads/1/3/4/3/134352057/814b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366010/normal_5fc99ad883f70.pdfIn PDF document text
    • https://falatunasozenu.weebly.com/uploads/1/3/4/7/134762474/vifugagukekelum-buwaguxeko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378856/normal_5fcc5b632e7fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454691/normal_603f7e14653b7.pdfIn PDF document text
    • https://jowesezowu.weebly.com/uploads/1/3/4/3/134366841/saterujezoso-maforikojo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413973/normal_606e7c3614bd8.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
    • 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_off0000e0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F4 5148 bytes
SHA-256: 918442a6cbcad6045c9900fc3ed0047dfe564ee77b437d8059b4c9e8838c20e8
font_01_sfnt_off0000f1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E9 13012 bytes
SHA-256: a456794a053475d7315b040e32582c1fd83b81eb780e854016a7ac1327cf51c2
font_02_sfnt_off00011977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11977 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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