Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec12ca5dd3cf034…

MALICIOUS

PDF

78.0 KB Created: 2021-01-12 00:30:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 631b7f02b5301bf577500cbea568c503 SHA-1: 086335d1944bf8fcf4dd260305a0c5a9b0e3bf7c SHA-256: 4ec12ca5dd3cf034f8b283706ca094683dbefe890a225aed9ed96e8c49982a9e
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of external URIs and a link farm on disposable hosting suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious intent to redirect users to potentially harmful websites.

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffset.ru/123?utm_term=csuf+title+ix+training+answers PDF link annotation
    • https://site-1216005.mozfiles.com/files/1216005/relaferaza.pdfIn PDF document text
    • https://site-1172223.mozfiles.com/files/1172223/animal_stack_3d_mod_unlimited_money.pdfIn PDF document text
    • https://site-1175420.mozfiles.com/files/1175420/guess_the_song_free_music_quiz_answers.pdfIn PDF document text
    • https://site-1177042.mozfiles.com/files/1177042/stack_ball_fall_game.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489050/normal_5ff2d88ea546f.pdfIn PDF document text
    • https://site-1172267.mozfiles.com/files/1172267/argox_cp-_2140_pplb_203_dpi_driver.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369916/normal_5f8b40cc60511.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369327/normal_5f8a84683a83c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477916/normal_5fe18f798d159.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401976/normal_5f9109dab8447.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367281/normal_5f8edfc645389.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/dagiwisopituvibur.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_off0000f286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF286 5000 bytes
SHA-256: eef62d193b7b8079d90fe2383d7d38e84e643769f81de46f38e0e714fb2d4358
font_01_sfnt_off000103ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AC 11168 bytes
SHA-256: 261ebff4c9a29b266ef593c016625054d7a6a7c2381587b12eb67051b8ccd1ea

Open this report in the interactive analyzer, or submit your own file for analysis.