Malicious PDF — malware analysis report

Static analysis result for SHA-256 be6481907581df20…

MALICIOUS

PDF

72.8 KB Created: 2021-03-08 07:16:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6a38cff5e85201c74b724b19db17a35b SHA-1: 1aee11b0252176c882208cd6a7a316e42b96deed SHA-256: be6481907581df2041833edbda148ba536bedffa555b0de746783236f985ae03
154 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains embedded URLs, one of which, 'https://yafferge.ru/wix?keyword=appearances+can+be+deceiving+synonym', is flagged as a malicious redirector. The document body is heavily obfuscated, but the presence of malicious URLs strongly suggests an attempt to lure the user to a compromised site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/wix?keyword=appearances+can+be+deceiving+synonym In PDF document text
    • http://mixit.info/567944851881c9y0.pdfIn PDF document text
    • http://krokoboko6.xyz/37306712590fm37r.pdfIn PDF document text
    • http://mx50off.info/808801578176m95c.pdfIn PDF document text
    • http://sayseedokg.com/winazevulukendgnc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391001/normal_6005030ee5e91.pdfIn PDF document text
    • http://stingeksoj.online/hmrc_cumbernauld_telephonexxkex.pdfIn PDF document text
    • http://future-techno.ru/hp_laserjet_1320_manual_feed_problemspl0z7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373261/normal_5fe91e9e9ab53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466173/normal_603e7a0f9e9c9.pdfIn PDF document text
    • http://sun-italy.space/coffee_day_global_limited_annual_report_20175dl8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416938/normal_6035cf1f3dcea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407986/normal_5ffca41cbd63b.pdfIn PDF document text
    • http://itwow.info/luwebovuzelavunenodelarow7cz1z.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/41d821b9-ef09-46e6-9c25-8f4e36050540/how_to_connect_dymo_labelwriter_4xl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6638b6f3-14a0-4b43-b204-3928a86fe776/alpine_mrv-f300_4-channel.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/nupadirezumewo.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/pifasovilakufa.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/garmin_nuvi_255w_software_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4055983-fc1a-4573-b268-0f9f817bd45e/27648865778.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/hand_lettering_worksheets_alphabet.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/47648872590.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/central_square_formerly_tritech.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/74114031519.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/68748819284.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_off0000ddb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB7 5652 bytes
SHA-256: ed49cc0d0fb1ee8291e8e1dfe0e7208fa319aee5267d6977c6d3dc259ecde316
font_01_sfnt_off0000f0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E0 10780 bytes
SHA-256: d8e24fb76a867078a49b85114598e4b005f3bc0bf49f858f8b8abd5c2b755e42

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