Malicious PDF — malware analysis report

Static analysis result for SHA-256 170cae3d3a5182eb…

MALICIOUS

PDF

79.6 KB Created: 2021-02-22 02:44:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d888bfb69e8edaf351ce8d45e5295339 SHA-1: bf3f1fc4ff82ebbd9e12c213f679f797e6b29ed0 SHA-256: 170cae3d3a5182ebafe5ab020b6101203375b8ff884d2f7adf676bebc096a4fd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs are used to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/wix?keyword=friendswood+texas+christian+school PDF link annotation
    • https://jovegubegatok.weebly.com/uploads/1/3/5/3/135318826/zomujerug.pdfIn PDF document text
    • http://copyrightsupport-ig.com/how_to_cite_the_author_mlahasyh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420767/normal_5fde617ce4e0f.pdfIn PDF document text
    • https://wanezevidika.weebly.com/uploads/1/3/4/5/134588498/givunududotub.pdfIn PDF document text
    • http://zinuvudoliku.iblogger.org/19078215835.pdfIn PDF document text
    • http://sushibara.net/rubatojobavibgwiv.pdfIn PDF document text
    • http://luminar2-download.xyz/re_zero_light_novel_wikikfzs7.pdfIn PDF document text
    • https://zevebijupaxize.weebly.com/uploads/1/3/4/7/134754497/savajajoxukipawu.pdfIn PDF document text
    • https://jibajupo.weebly.com/uploads/1/3/1/6/131636806/busofilek-zoxujigo-losejotej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443823/normal_5ff3500e65e51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419198/normal_6024c7e49dc9d.pdfIn PDF document text
    • http://terem.space/cbt_nuggets_ccna_voice_640-_461gtois.pdfIn PDF document text
    • https://nunipotewisi.weebly.com/uploads/1/3/4/8/134892443/nebunazikutomuwiwe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zagopemolal.rf.gd/zumokole.pdfIn PDF document text
    • http://winerogogul.epizy.com/apple_router_software.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_off0000f1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EE 5140 bytes
SHA-256: 640fb1e049ac0083b86fe22981cd921d4a17d2e9eae571f2df43b40e1498bd59
font_01_sfnt_off00010374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10374 14916 bytes
SHA-256: f9246012bc996db889b5eadae2f19009bb1e84449ff43ef575b1c8a5f91d6598

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