Malicious PDF — malware analysis report

Static analysis result for SHA-256 439246a9772b3a97…

MALICIOUS

PDF

65.9 KB Created: 2021-02-26 05:46:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4933c998e09554e1dccf76fddd28e63c SHA-1: 51cc9d5835e09a2a582502b8afde0f841704eff5 SHA-256: 439246a9772b3a9711fa4716b8c7f89580de01dd93e7dd45d279042b1ae26029
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, identified as a link farm. One critical heuristic indicates a link to known malicious redirector infrastructure. ClamAV also detected this file as a phishing trojan. The embedded links likely serve to distribute malware or lead users to phishing sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=young+person%2527s+guide+to+the+orchestra+worksheet In PDF document text
    • https://static.s123-cdn-static.com/uploads/4450509/normal_6009a1045e310.pdfIn PDF document text
    • https://vunafenivanisip.weebly.com/uploads/1/3/5/3/135303543/jobofanibigugod.pdfIn PDF document text
    • http://rigoditibalun.mywebcommunity.org/bapobene.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387825/normal_5ff965ae5492f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370089/normal_5fd987b6d3472.pdfIn PDF document text
    • http://pedumerik.sportsontheweb.net/my_verizon_fios_remote_wont_change_channels.pdfIn PDF document text
    • https://suzoniku.weebly.com/uploads/1/3/4/4/134456843/9127981.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/93378321214.pdfIn PDF document text
    • https://xevogivuzu.weebly.com/uploads/1/3/5/3/135350373/08554.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481289/normal_603866adf246d.pdfIn PDF document text
    • https://warevinigipa.weebly.com/uploads/1/3/4/8/134898994/5263385.pdfIn PDF document text
    • https://zumonula.weebly.com/uploads/1/3/5/3/135323502/93fe3b.pdfIn PDF document text
    • https://kajubogoxin.weebly.com/uploads/1/3/0/9/130969430/tuxedefonise.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408707/normal_600ef6cb5976c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nosigegu.onlinewebshop.net/what_is_the_sum_of_exterior_angles_of_a_regular_polygon_of_nine_sides.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_off0000c535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC535 5452 bytes
SHA-256: 136316efba29e996830438fef92ed9757fa7148999c6803f836c1fdecc4e3978
font_01_sfnt_off0000d7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E0 10228 bytes
SHA-256: fbcf68e804f5e43bbb5fb8716c895149340c277876da55a26ef2a27f3ff33e8f

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