Malicious PDF — malware analysis report

Static analysis result for SHA-256 305b012107cb3cf1…

MALICIOUS

PDF

73.9 KB Created: 2021-03-13 15:51:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 8b9829aaa09ba0c60c1d5bbb0c7b2446 SHA-1: 6ec1381f5952e643c120a39b20925be6c9d4672c SHA-256: 305b012107cb3cf11ef5168661db8d7e9557e7f2d7c2c8465c89f3e3ae613361
154 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/wix?keyword=uci+2020+acceptance+rate'. This indicates the document is designed to redirect users to a malicious site, likely for phishing or malware distribution. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL is sufficient evidence of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=uci+2020+acceptance+rate In PDF document text
    • https://cdn-cms.f-static.net/uploads/4475863/normal_603773c398212.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404290/normal_601ba9ccbd867.pdfIn PDF document text
    • https://cdn.sqhk.co/kidurukazag/Un02Tjd/glass_smash_sensor.pdfIn PDF document text
    • https://cdn.sqhk.co/rowubuvuke/ieX5SEK/zowanig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419849/normal_5fc92ffd17940.pdfIn PDF document text
    • https://cdn.sqhk.co/rijizedot/bgdhj4D/onelogin_protect_mobile_app.pdfIn PDF document text
    • https://cdn.sqhk.co/ramawuvade/1gdi0Z7/lasuzekekelejoju.pdfIn PDF document text
    • http://lavkavkusa.store/dubai_drift_2_mod_apk_rexdl2iba8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412905/normal_5fda1f661f396.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478932/normal_603173be0ea8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459777/normal_5fdb080222147.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393916/normal_6001e33de65b9.pdfIn PDF document text
    • https://cdn.sqhk.co/faxenukev/iihdAzV/51277853852.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426812/normal_6032593f6edda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453326/normal_5fd125ddddf72.pdfIn PDF document text
    • http://garderob-podolsk.ru/resumen_del_libro_mundo_de_sofia_por_capitulos576bu.pdfIn PDF document text
    • https://cdn.sqhk.co/zatuwifezub/PFjghhP/67939809667.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8df7ce64-2342-43d1-94d8-60eaf4a40916/what_are_angel_numbers_and_what_do_they_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92735ec6-f2a8-4581-bfc9-8470aeb896cb/95799281263.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_off0000e4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F9 4984 bytes
SHA-256: 3f164cec4ed63db3a9a2101a5265f9154e5ec2482d4c92fac342532ac8b3763d
font_01_sfnt_off0000f602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF602 10712 bytes
SHA-256: bd010daaef7f5d33df4805e8fa4d06a4ec7fc1ee4c853aa849348deb3d1089cf

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