Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f78301e4fc5812…

MALICIOUS

PDF

73.3 KB Created: 2020-11-23 11:36:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c30b1fed98f2a0f814c892a3099b66b3 SHA-1: 9c43f2bb1670277308af64675e0d5e2ad6dd8941 SHA-256: 41f78301e4fc58121728976efa5a2d8f20dc9940e4c6cddf43aae0cec4bbac26
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, with the heuristic 'PDF_SEO_LINK_FARM' indicating a potential link farm. The document body, though heavily obfuscated, suggests a lure related to an 'Isotope and periodic table review worksheet', which is likely a pretext to drive traffic to malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffine.ru/123?utm_term=isotope+and+periodic+table+review+worksheet PDF link annotation
    • https://vebafuxitupum.weebly.com/uploads/1/3/4/8/134890404/9733883.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/1867598.pdfIn PDF document text
    • https://zidajikivumab.weebly.com/uploads/1/3/4/6/134625594/dewolozuresupom.pdfIn PDF document text
    • https://jasazifo.weebly.com/uploads/1/3/1/4/131437377/050516f.pdfIn PDF document text
    • https://numuluga.weebly.com/uploads/1/3/4/3/134307024/webileki.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/7304884.pdfIn PDF document text
    • https://memumozevevu.weebly.com/uploads/1/3/4/3/134378747/napixe_xuvev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402938/normal_5f9770c6de468.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462362/normal_5fae15f6be5fc.pdfIn PDF document text
    • https://motutipe.weebly.com/uploads/1/3/4/6/134674000/fefubazati.pdfIn PDF document text
    • https://miwilokak.weebly.com/uploads/1/3/4/3/134375457/rikibogeri_vixopogit_xemusakedemix.pdfIn PDF document text
    • https://dakovogusuzulex.weebly.com/uploads/1/3/4/5/134595229/34276.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/midipes/wekubojodadapuxowewevom.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/cream_puff_history.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53f87fd6-d402-4bf4-8221-87e234f5a567/the_21_day_sugar_detox.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/ielts_listening_answer_sheet_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07e22010-764a-4b1f-b416-302df180f65b/gexukosuwevikuxu.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/multicellular_organisms_levels_of_organization_worksheet.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_off0000e196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE196 5456 bytes
SHA-256: 37108824980af6c20d491792b4f0c774143665a3a961cb58c010e027d3cda99e
font_01_sfnt_off0000f42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42C 10464 bytes
SHA-256: a46df5753022a92eb87f7266189b44cfe683b8b92dea9677fa3ee9e929c229ab

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