Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d70320f2c9f805…

MALICIOUS

PDF

82.2 KB Created: 2021-03-05 15:44:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: b43cd4f34974ad0264ae4ca350a96b78 SHA-1: d43174891f7efe1b5c60108c828beacaac7162cb SHA-256: 52d70320f2c9f805f9304107a302d7428bc1818fa9ee449e17ea0c55517e97e0
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution scheme. The presence of 'utm_term' in one of the URLs indicates a potential tracking mechanism for malicious campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/aws?utm_term=ford+mustang+ecoboost+for+sale+australia PDF link annotation
    • http://vengriya.space/cell_structure_and_function_class_8_mcqmedf6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421472/normal_5fedf8eb2d456.pdfIn PDF document text
    • http://svoydvalend.xyz/eat_fit_meal_plan_reviews_redditp66zd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420930/normal_6005daf6b6747.pdfIn PDF document text
    • http://onatural.space/2242826722zfe6l.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/MyfQ7id/potafil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406793/normal_5ff9487e79b7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474465/normal_600dfc8c7b6e4.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxinugokas/DidnSje/puvutidewesiwoke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379030/normal_601a14e35320f.pdfIn PDF document text
    • https://cdn.sqhk.co/saguregifu/ijBf9jh/dragon_spirit_arcade_rom.pdfIn PDF document text
    • http://boevoenlp.com/646385359529jec.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/uGmdjjv/gelato_ice_cream_frozen_yogurt.pdfIn PDF document text
    • http://jaxaxanukijomel.22web.org/jimorulud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://josuguremim.epizy.com/gagopada.pdfIn PDF document text
    • http://lurosevide.epizy.com/4412428010.pdfIn PDF document text
    • http://lejibunigazaxa.epizy.com/38233813772.pdfIn PDF document text
    • http://nareboveridur.epizy.com/54815900601.pdfIn PDF document text
    • http://lagadasisipas.rf.gd/facebook_video_to_iphone_2019.pdfIn PDF document text
    • http://tazefuwavubu.rf.gd/cisco_anyconnect_3._1_windows_8.pdfIn PDF document text
    • http://pudubekij.epizy.com/4743803572.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_off00010465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10465 5436 bytes
SHA-256: 2451425e516b9afa3f08b0f497d2aee7e771a09b56206dd05a82489e7588adf5
font_01_sfnt_off000116cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CC 10656 bytes
SHA-256: a1524cf470707c72bf50831661ce720439dca99ff520749d39f914def89c4611

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