Malicious PDF — malware analysis report

Static analysis result for SHA-256 02a361f21018e11d…

MALICIOUS

PDF

86.2 KB Created: 2021-05-19 10:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4e952e238f23d204865c9cb9788340c4 SHA-1: c927f24272db9ad2ebd5a621d856edc0b35b4f3a SHA-256: 02a361f21018e11dbdda48eaa33e77e50ccabc14db4a1d4c67debacb095b2d2d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/strik?utm_term=holt+handbook+third+course+chapter+3+answer+key PDF link annotation
    • http://dovamemowiruz.iblogger.org/causes_of_esophageal_cancer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370777/normal_6047ef6e8a642.pdfIn PDF document text
    • http://merogerofame.66ghz.com/fuel_consumption_calculator_excel_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384046/normal_5fc71aeec3a8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459034/normal_60184b27800cb.pdfIn PDF document text
    • http://jedugefipevama.iblogger.org/nefekazuxidosewofib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413848/normal_603fe74e98e44.pdfIn PDF document text
    • http://tokexemi.iblogger.org/how_to_adjust_self_propelled_lawn_boy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486034/normal_6052c2b561913.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/e4f6b8ec-0031-4d42-ac46-d7607eb258b0/18523573701.pdfIn PDF document text
    • http://jenuvuzawo.epizy.com/27328779194.pdfIn PDF document text
    • http://mowigefugitixa.epizy.com/xotimubanemopegesug.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/husqvarna_435_chainsaw_carb.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/a_partir_de_que_edad_se_puede_tomar_proteinas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b071d65b-c7bb-423f-ac51-10a96d7db89f/47196370450.pdfIn PDF document text
    • http://rugoxag.rf.gd/71604377528.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e7db28d-a559-4db7-9640-4b0443a136e3/lininaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/133cd012-15e5-4230-bc98-8b896bbe3901/lincoln_logs_instructions_big_l_ranch.pdfIn PDF document text
    • http://memuwalarike.rf.gd/zataw.pdfIn PDF document text
    • http://sugexure.rf.gd/bar_graph_worksheets_6th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f3dafb6-4458-4813-9543-2d275515408d/44556139321.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab4637ba-0b08-4393-9c12-bf2cb75fcde7/99917769847.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_off000113f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F5 5684 bytes
SHA-256: 09f1c4165cac19c836a38eee636cbcf9e4fec88662599e97bd6a9f7af8ac8419
font_01_sfnt_off0001274e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274E 10656 bytes
SHA-256: e3aa11f034e5372dd2b0928cf517ddd36c01b791bf6f04211b204e6c34f0a6cd

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