Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b915e6b698f876a…

MALICIOUS

PDF

78.8 KB Created: 2021-04-06 03:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3c7f944e97a0221575025ac4fb2c8628 SHA-1: 6ee577133c7244a371db7f18a01898c6e8f30149 SHA-256: 9b915e6b698f876ad99af5fa3506548fcd58ae6bb0a3bdd3ac89629cc2c73333
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as an SEO link farm and a high-severity heuristic flagging it as an image lure linking to an SEO redirector. The primary redirector URL, 'https://nipisod.ru/strik?utm_term=8+stages+of+emdr', is suspicious. While no scripts were explicitly extracted, the PDF structure and heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://nipisod.ru/strik?utm_term=8+stages+of+emdr PDF link annotation
    • http://vetizivonisare.22web.org/11268712660.pdfIn PDF document text
    • http://rexasokozeg.iblogger.org/lizufedovirufuxut.pdfIn PDF document text
    • http://vizezokope.iblogger.org/how_to_update_address_on_drivers_licence.pdfIn PDF document text
    • http://gababez.iblogger.org/78706150719.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://baperosuvo.rf.gd/94564151177.pdfIn PDF document text
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_bf6402cc03f54c28982cb8be1f02173d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/zefotasesume.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/pokemon_go_quick_guide.pdfIn PDF document text
    • http://tokilofi.rf.gd/niwaner.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/78406546758.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/axial_chirality.pdfIn PDF document text
    • http://lubudag.epizy.com/robotic_arm_project_using_arduino.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/python_selenium_headless_chrome_file.pdfIn PDF document text
    • http://sobuzazan.rf.gd/getipizufolovelixuk.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/7149910771.pdfIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_3f80cbb289dc4b789429e4a2c01ed317.pdf?index=trueIn PDF document text
    • http://dizodufuxot.rf.gd/cd_canes_de_ninar_palavra_cantada.pdfIn PDF document text
    • http://pepebejawu.epizy.com/zisufabaz.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/90142986110.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/colliers_sydney_industrial_report.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_off0000f732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF732 5292 bytes
SHA-256: 11c75f1a49bbdd30686d1782c0a75beb190ec8bf7a559214386ebf0bb955cc03
font_01_sfnt_off00010919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10919 11100 bytes
SHA-256: a252b6d4b9e63c1c92b14219fa0a9b23ee3cd40b8f426d27c3051c66f9567a3f

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