Malicious PDF — malware analysis report

Static analysis result for SHA-256 3188b92eed29b833…

MALICIOUS

PDF

73.1 KB Created: 2021-01-26 16:11:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b0c43e91dcc522a5bf9fba7da3d84431 SHA-1: 9b7799086e5819bfee917f7d98036055500aa8f3 SHA-256: 3188b92eed29b83377d87d9aeb9646548121e84b8bb14eb8c8b74867df17403e
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://crophysi.ru/wb?keyword=block%20craft%20mod%20apk%20unlimited%20diamond'. This, combined with a high ML classifier score and ClamAV detection, strongly indicates malicious intent. The presence of a download button lure further supports a phishing or malware distribution scenario.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=block%20craft%20mod%20apk%20unlimited%20diamond In PDF document text
    • http://pavawafupef.66ghz.com/nizuluwidel.pdfIn PDF document text
    • http://kijorifoweb.22web.org/programming_fundamentals_coursera_answers.pdfIn PDF document text
    • http://arnautmebel.ru/70s_music_artists_r_bagnde.pdfIn PDF document text
    • http://swiss-gear-top.xyz/582038394343i5tm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470533/normal_6005353e7e273.pdfIn PDF document text
    • http://freshmind.net/safe_zone_lyrics_seebu64ey.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484633/normal_5feaf2b31939d.pdfIn PDF document text
    • http://helplnstagramcontact5087423.com/fuxazosivamurikax8ess.pdfIn PDF document text
    • http://bnl-jobs.com/wallpapers_for_your_phone_free2jjko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ribezewipuzez.epizy.com/fasiv.pdfIn PDF document text
    • http://robefopatobut.epizy.com/73825712477.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/61721198082.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/battery_tender_solar_charger_manual.pdfIn PDF document text
    • http://wusekugu.rf.gd/nimevefela.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/ti_84_plus_graphing_calculator.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/wutefofuned.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_off0000e292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE292 5236 bytes
SHA-256: d21af942ae145eebc1cdb110d61006d8b28ad45bace03c476b586c641d121402
font_01_sfnt_off0000f454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF454 10256 bytes
SHA-256: 03eb903b7aecd062c673db2e33f7cd691a182f50f729166ee2b02775b868cad2

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