Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dda4fc11c7f2206…

MALICIOUS

PDF

75.9 KB Created: 2021-01-19 20:09:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: f9fa97093adde31fe5e811f5d082d6aa SHA-1: e163c853f72c447bdbc03cc3c7320cf25ac6444a SHA-256: 4dda4fc11c7f22064ef593225465a1ff96a65262fb8e13e00e6e24938e7684ef
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://crophysi.ru/123?utm_term=teavana+green+tea+gyokuro+near+me. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, suggesting an attempt to drive traffic to various sites. The ML classifier and ClamAV also flagged this PDF as malicious, reinforcing the assessment of a phishing or malware distribution attempt.

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://crophysi.ru/123?utm_term=teavana+green+tea+gyokuro+near+me In PDF document text
    • https://site-1168129.mozfiles.com/files/1168129/disney_special_agent_oso_games.pdfIn PDF document text
    • https://site-1172440.mozfiles.com/files/1172440/virtual_piano_free_download_for_windows_7.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/dJbKgiD/70670852366.pdfIn PDF document text
    • https://xironudobavus.weebly.com/uploads/1/3/4/4/134461104/miwojalazalazotuze.pdfIn PDF document text
    • https://kekebamifibem.weebly.com/uploads/1/3/1/6/131606854/kalasizuvetu_pumoperonis.pdfIn PDF document text
    • https://jiranunurojowoz.weebly.com/uploads/1/3/1/8/131860868/jujezuvup_zavowajirekom_safarekex.pdfIn PDF document text
    • https://wovegusokab.weebly.com/uploads/1/3/4/8/134850220/jawidid-fogigotif-vepulituresuwu-penuzinij.pdfIn PDF document text
    • https://site-1173734.mozfiles.com/files/1173734/mini_stroke_treatment_australia.pdfIn PDF document text
    • https://fenorepaxok.weebly.com/uploads/1/3/1/8/131856491/13e72e45b1603d.pdfIn PDF document text
    • https://site-1175458.mozfiles.com/files/1175458/xemokisavinekabifur.pdfIn PDF document text
    • https://site-1174888.mozfiles.com/files/1174888/how_to_deal_with_stress_worksheets.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/vepulakanug.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/badodemebo/7931453598.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/barton_removable_mainsheet_track_system.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/mokopoze.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/petty_cash_voucher_format.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_off0000e9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B2 4968 bytes
SHA-256: 6e9ac37229fbc0d74dad2d82041d202d2dad1f69a95c768feffd03f71ff2d4a5
font_01_sfnt_off0000faa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA0 11864 bytes
SHA-256: f1bbc56ca935c445aec499de349dfbd8b210cacc856e950592d1dd01899e1442

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