Malicious PDF — malware analysis report

Static analysis result for SHA-256 5100d595399e9ff0…

MALICIOUS

PDF

86.9 KB Created: 2021-04-16 10:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 320c2e4301cf7116dd8c6af43668987a SHA-1: 7af77db18769f67745bef761dc45656034f5846c SHA-256: 5100d595399e9ff0e53169dc12eb143f74c875bec7cbc8e4ee33b3fadf47c9bb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, and the presence of external URIs further supports this. While no scripts were explicitly extracted, the nature of PDF exploits often involves JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=does+a+graco+pack+and+play+need+a+mattress PDF link annotation
    • https://laregokirula.weebly.com/uploads/1/3/0/9/130969776/lawad.pdfIn PDF document text
    • http://dusanaputojinon.mygamesonline.org/comparative_and_superlative_adjectives_lesson_plan.pdfIn PDF document text
    • https://rewemekekebaz.weebly.com/uploads/1/3/1/4/131406535/bezegebe.pdfIn PDF document text
    • http://kowuterada.mygamesonline.org/l_encyclopdie_du_tricot.pdfIn PDF document text
    • https://mukeluxera.weebly.com/uploads/1/3/4/5/134528716/9bd75c2c.pdfIn PDF document text
    • https://vukajikabazaxeg.weebly.com/uploads/1/3/4/7/134711597/3088761.pdfIn PDF document text
    • https://cdn.sqhk.co/fakineduxafe/CKmjc62/jinibivi.pdfIn PDF document text
    • https://dakurawal.weebly.com/uploads/1/3/5/3/135321076/a3f989fa.pdfIn PDF document text
    • https://cdn.sqhk.co/nitumatemi/igZigtm/24262592215.pdfIn PDF document text
    • https://cdn.sqhk.co/noloxunipe/hK31CfL/tutorial_lightroom_cc_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/libobivole/hJ7AI20/gogo_live_twitter_vcs.pdfIn PDF document text
    • https://cdn.sqhk.co/widafopaj/Ye4jbkP/13251289068.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/gljdhaD/3642049112.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/860d25ca-9916-46ff-afc1-9130f3dd0c8b/90741714826.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/critical_thinking_questions_examples_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cfb8481-c5d4-44bb-b3c9-6bbd8215c572/8602497756.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f078645d-8ef9-452c-bcff-d52602afc2a4/patiroware.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/davowup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81ff226d-0467-4bfb-bc0d-21f101721ad9/7_projects_to_practice_html_and_css_skills_for_beginners.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_off000114a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A8 5556 bytes
SHA-256: e9a32fddb91b0c1455491091ea1478516b6e1b829f6a2b9001f540281252abad
font_01_sfnt_off00012796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12796 11548 bytes
SHA-256: 2383d059eb822ce2b4c76cf6f65bd0c933053a5c2e17e74b815f560278ffdd13

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