Malicious PDF — malware analysis report

Static analysis result for SHA-256 82e5430851f9e687…

MALICIOUS

PDF

96.9 KB Created: 2021-04-22 13:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f62b504ce93c236cf3f88990532221b3 SHA-1: 95e2fba7d548f3fc3538cdaa01228a1514afc6e1 SHA-256: 82e5430851f9e687870589edfc3d3b4b965611e8552d49cb93291976a8aa1aee
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to a periodic table, likely to trick users into clicking embedded links.

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://xajibur.ru/strik?utm_term=tabla+peri%25C3%25B3dica+de+naturales PDF link annotation
    • https://cdn.sqhk.co/jujifefa/iUviagf/wafebotijomorewodamosaj.pdfIn PDF document text
    • http://sitebomobegux.sportsontheweb.net/qualitative_research__evaluation_methods_integrating_theory_and_practice.pdfIn PDF document text
    • https://cdn.sqhk.co/vudemijugamu/NVgfieQ/gozobomawutofe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387433/normal_604cfb0a5873f.pdfIn PDF document text
    • http://timinome.getenjoyment.net/1124448973.pdfIn PDF document text
    • https://cdn.sqhk.co/zibomevuguli/jiigpih/76321704662.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471273/normal_5ff3a0996b05e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385217/normal_5fd0e188df6a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491946/normal_5fd30e90aadd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459163/normal_605e1b652d337.pdfIn PDF document text
    • https://cdn.sqhk.co/kizofapekeku/P0pf6gf/simple_business_plan_template_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373304/normal_5ff69f68d7a3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447097/normal_60043f42e287b.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://xologikaju.atwebpages.com/physically_based_rendering_download.pdfIn PDF document text
    • http://kaxuwenewutexu.myartsonline.com/wajodafimum.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/45353197095.pdfIn PDF document text
    • https://87d5e434-dc39-4d64-8681-877d64e204d5.filesusr.com/ugd/5660ac_fdbc89309d584215bf516b6d26ce48fa.pdf?index=trueIn PDF document text
    • http://vujapoguxesak.myartsonline.com/cours_anglais_grammaire_conjugaison.pdfIn PDF document text
    • https://cb0508fd-2a1f-4901-a161-a76823ee8e4f.filesusr.com/ugd/52013e_a5e734d0714a4745859c26f259b6ac92.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gateme/likowu.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_off00012d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4D 5064 bytes
SHA-256: 687c158ece002f9897a63f673ef6333e77dc8b0dc45dd71b70a144cdc2f25e1f
font_01_sfnt_off00013e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E83 12320 bytes
SHA-256: f39bdaccd51b5e9f037b28da18bad0d20c98ef49c4170f92d0fe2a3979dbdaae
font_02_sfnt_off00016668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16668 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333