Malicious PDF — malware analysis report

Static analysis result for SHA-256 933959c45e4f0720…

MALICIOUS

PDF

74.9 KB Created: 2020-12-18 07:41:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6206f11127a3e6d3b99dd1eea2f8954d SHA-1: 7bd38e1252a30fe2443ccaa3365e11d2c3ae5ef9 SHA-256: 933959c45e4f0720c79f8a137c4d242a9f836144280ee48c35bf82a0ae3f0065
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism. The 'instruction manual' lure in the document body, combined with the ML and ClamAV detections, indicates a malicious intent to direct users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and external links are indicative 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
  • 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://traffking.ru/123?utm_term=instruction+manual+keurig+coffee+maker PDF link annotation
    • https://vodemiteju.weebly.com/uploads/1/3/4/7/134722100/cb59b3d2c8.pdfIn PDF document text
    • https://kakawugob.weebly.com/uploads/1/3/0/9/130969990/fuduzikupodini-xowolip.pdfIn PDF document text
    • https://zejeranuko.weebly.com/uploads/1/3/4/6/134649068/c50c4.pdfIn PDF document text
    • https://gazubulurogul.weebly.com/uploads/1/3/4/4/134493330/a103ea9206400b.pdfIn PDF document text
    • https://wowomake.weebly.com/uploads/1/3/4/6/134679477/gifuxodewarer.pdfIn PDF document text
    • https://kunimagim.weebly.com/uploads/1/3/4/6/134608209/20998.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/e75394b6-9118-44c4-b4d1-85e25912decc/57969260881.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d4a28139af037644e7e6/t/5fc24b6c6457125654875531/1606568814258/33054648207.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e6bd3398ff75152e0f70/t/5fc530279b1ed0353884fa55/1606758440369/lomam.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4cbf4e98326c0206e350/1606372544363/ponotalevajedujir.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1015360f2895dc1e86a3c/t/5fc2bf523c02f22b9d675a3b/1606598482112/dalopadituxa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5672c7848ba205d36dd8d/t/5fca8f12d57e9b2d19b1b06b/1607110419276/tennessee_titans_score_now.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc52be63398ff751549a8ba/t/5fd72753acac596b0cd43a39/1607935827640/h._pylori_treatment_guidelines_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/shinedown_45_tab.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_off0000e84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84E 5200 bytes
SHA-256: 575b39b965ae0411107be78abd6f929affe81e79410ca1bc404145e73550af2c
font_01_sfnt_off0000f9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E9 10976 bytes
SHA-256: 8b0031ca90bbf2cc78078a822d7810bdd3a1360c6cf393562d1dd65da97e64cb

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