Malicious PDF — malware analysis report

Static analysis result for SHA-256 f437a4b6d63159f4…

MALICIOUS

PDF

73.2 KB Created: 2021-05-31 21:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ff305ea54c72d7fbc4f718f44e83788 SHA-1: 30ac9e5df49bf6d0328e21362564dc203f6c9e7d SHA-256: f437a4b6d63159f430484edbdaaa9df27471e99490140dd4a1ffa9707b897a7a
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URI pointing to 'https://crysiq.ru/pbw?utm_term=bus+161+nj+transit+pdf', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to 'Bus 161 nj transit pdf'. No scripts were extracted, but the PDF structure and embedded URI indicate a malicious intent to redirect the user to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crysiq.ru/pbw?utm_term=bus+161+nj+transit+pdf
    • https://static.s123-cdn-static.com/uploads/4472793/normal_5ff71219403ad.pdf
    • https://static.s123-cdn-static.com/uploads/4470833/normal_5fe3e971c6cb2.pdf
    • https://cdn-cms.f-static.net/uploads/4451566/normal_6034a0ab910fe.pdf
    • https://pixofefen.weebly.com/uploads/1/3/7/5/137503885/a5b3908.pdf
    • https://static.s123-cdn-static.com/uploads/4380230/normal_5ff0a0612d9c3.pdf
    • https://cdn-cms.f-static.net/uploads/4366362/normal_6057e9db880a7.pdf
    • https://cdn-cms.f-static.net/uploads/4482858/normal_6016d30d596dc.pdf
    • https://vuketuwanez.weebly.com/uploads/1/3/4/5/134592446/1985108.pdf
    • https://static.s123-cdn-static.com/uploads/4408709/normal_5fc5aa9a0aa97.pdf
    • https://rajafobumexa.weebly.com/uploads/1/3/4/1/134109296/5b3c6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://supatibu.pbworks.com/f/how_to_change_gears_in_a_manual_car_smoothly.pdf
    • https://uploads.strikinglycdn.com/files/5a8de8b2-8cdd-462a-b0c6-f9545eade3b7/the_game_neil_strauss_audio.pdf
    • http://xujefix.pbworks.com/f/guzuderasipikud.pdf
    • http://funinupun.pbworks.com/w/file/fetch/144419007/12417465386.pdf
    • https://uploads.strikinglycdn.com/files/d8144e71-6123-48ce-9751-aa644872faec/how_much_does_chick_fil_a_pay_per_hour_in_nc.pdf
    • http://kekirow.pbworks.com/w/file/fetch/144412473/bir_kawit_phone_number.pdf
    • http://nilanom.pbworks.com/w/file/fetch/144416556/what_is_an_output_force.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1f3.bin
b9baa9b1b9c7ad37e41b2e9b1a93a4a60f999f08f7989308679510d30b419811
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F3 5332 bytes
font_01_sfnt_off0000f42f.bin
0384886ac74775a0d09c8bef9a09d095bf6d10bdc7664caeecba377f717ab8ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xF42F 10416 bytes