Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc39aa3b2f639390…

MALICIOUS

PDF

72.9 KB Created: 2021-03-27 21:31:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a87d1a607e275ea66ce5884596677101 SHA-1: f43c76fec3d50b1e7b4ac4e172c2da551d83a8f7 SHA-256: bc39aa3b2f639390f59ab47b870c47348a512a2cdf56bacc6d6b32e87c9c2932
214 Risk Score

Malware Insights

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

The PDF contains numerous links, with one critical heuristic identifying it as a malicious redirector. The embedded URL 'https://dafemum.ru/award?keyword=b+pharmacy+syllabus+pdf+shivaji+university' is a strong indicator of a phishing or malware distribution attempt. ClamAV also detected the file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', further supporting its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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.
  • 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://dafemum.ru/award?keyword=b+pharmacy+syllabus+pdf+shivaji+university In PDF document text
    • https://cdn.sqhk.co/dogutadova/dgghgeu/extreme_car_simulator_2016_androidoyunclup.pdfIn PDF document text
    • https://cdn.sqhk.co/jomububorava/jzSgg6O/new_exoplanet_names.pdfIn PDF document text
    • https://cdn.sqhk.co/jekidase/hb7Abjb/loophole_meaning_in_bengali.pdfIn PDF document text
    • http://jirobanu.22web.org/data_science_cheat_sheet_for_business_leaders.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/doxifuba/subanewobaxojuwefago.pdfIn PDF document text
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_271afa2b67434551b6856e998d836b81.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rufonali/denevodanexoxav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2861cc29-32c1-4ed0-9e18-b85fd10a1aa0/worirotafegubakeb.pdfIn PDF document text
    • https://3350d16e-2476-487b-844f-3942c02081ad.filesusr.com/ugd/25270e_bf398edc42a0480eb3be283400aeb0db.pdf?index=trueIn PDF document text
    • http://xanivuva.epizy.com/muwufemalosaxelu.pdfIn PDF document text
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_d77ac8deaea744c687353f49079e6fa4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/cules_son_los_numeros_naturales.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17abf91a-2818-4b6f-a96b-917b1a9d0305/vazokuxorugapibup.pdfIn PDF document text
    • https://8650d040-a33d-467d-a608-6706f181f11b.filesusr.com/ugd/61b8bf_8363faaafbed4dd3bf63848ce72a852c.pdf?index=trueIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_d71499c85c274678836ca52614beb5f8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/95a32922-016c-486c-9aef-d546d17d6cc5/logitech_g700s_mouse_not_working.pdfIn PDF document text
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_01e9c319b50f4205ba03ac4040fa7759.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/dunefamumeloxuwusafolat.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/best_1080p_movies_site.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_off0000dd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD60 5824 bytes
SHA-256: 23b872ce401d0af93304215d20a59b9824c8deb97963ca3122679901c0c6721e
font_01_sfnt_off0000f115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF115 10916 bytes
SHA-256: 116fd0700a1acb15a11298fe88afdcfc82b7cde6049f09792b775e145342f8c1

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