Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58db355c9e74303…

MALICIOUS

PDF

67.7 KB Created: 2021-01-22 12:58:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 5b970ab9523f85780645be5f05ed669d SHA-1: 9b448c038f1c74bba4df4bede7d05d90ff5023ac SHA-256: a58db355c9e74303cfb22e3f8686a0214d1c30a8546928be4e4ffaf699c92905
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically pointing to 'crophysi.ru'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the PDF and the malicious URL suggest it's designed to lure users to a compromised site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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/123?utm_term=k+swiss+tubes+millennia In PDF document text
    • http://xigegojaliku.iblogger.org/23525930481.pdfIn PDF document text
    • https://wurudejokifar.weebly.com/uploads/1/3/0/7/130776262/bajomu_pakita.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujutenifo/jgidhdV/guzukipap.pdfIn PDF document text
    • https://panikudar.weebly.com/uploads/1/3/1/4/131437701/fobeladot.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/b1jhja0/tamil_funny_videos_free_download_for_whatsapp_hd.pdfIn PDF document text
    • https://cdn.sqhk.co/volumusigu/tUGtieZ/pancake_recipe_using_gluten_free_self_raising_flour.pdfIn PDF document text
    • https://rakimazigikan.weebly.com/uploads/1/3/2/3/132303322/gizewogafuwabi_nawigafetelubux_wiwaxirisiwewik_zajabisiketib.pdfIn PDF document text
    • https://cdn.sqhk.co/fasotaluvose/2Shh4K4/80380100763.pdfIn PDF document text
    • https://povufajesozibu.weebly.com/uploads/1/3/0/7/130739002/8259856.pdfIn PDF document text
    • https://mekilogeb.weebly.com/uploads/1/3/0/7/130775247/a4194.pdfIn PDF document text
    • https://kaneloko.weebly.com/uploads/1/3/1/4/131408798/3671635.pdfIn PDF document text
    • https://gojupisot.weebly.com/uploads/1/3/4/0/134016698/7742128.pdfIn PDF document text
    • http://jufawet.iblogger.org/xiwavoteponubimemuxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xatudoxi.epizy.com/adding_decimal_numbers_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/mupaputedikikisupidal.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/gym_agreement_template.pdfIn PDF document text
    • http://katezoluvezile.epizy.com/dead_by_daylight_legion_cosplay_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/canoscan_9000f_mark_ii_scangear.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/54934396946.pdfIn PDF document text
    • http://nexuvojof.epizy.com/chocolatier_game_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/awdhesh_premi_song_3gp.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC76 4708 bytes
SHA-256: fbfb9579c7f70aedb950fe2b4308d42773dc5109b0b2caedc85d7d9732638123
font_01_sfnt_off0000cc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC67 11276 bytes
SHA-256: da84129464e01c50c2699ec55b7334e9ec4caa0cd76ca883e30c76d2a8d3bfc5
font_02_sfnt_off0000f225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF225 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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