Malicious PDF — malware analysis report

Static analysis result for SHA-256 916822fc01c4d3b5…

MALICIOUS

PDF

70.4 KB Created: 2021-02-16 10:52:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6837118b66f82ee90918a04da16cf908 SHA-1: 34f6674496aeea0666eaa510421f418f23399cdc SHA-256: 916822fc01c4d3b51aa48628b9af2cf58a045c7d826633ef5cf86fd559f78853
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

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://leonvi.ru/123?utm_term=how+many+carbs+in+a+dunkin+donuts+frozen+hot+chocolate PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450040/normal_5fce58f3c32ff.pdfIn PDF document text
    • http://cardioactiveuficiale.site/math_worksheets_factoring_trinomialsh9ld1.pdfIn PDF document text
    • http://kudretbozaci.com/11630751538vyfh9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500183/normal_5ff0c648d997f.pdfIn PDF document text
    • http://0fruit.space/radio_online_clube_fm_brasiliaqc9t5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366020/normal_5fe0c7f6e471a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466366/normal_600930839b404.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462037/normal_60244f7899e16.pdfIn PDF document text
    • http://reduslimer.website/gafolugoleravifuxijbngla.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443819/normal_6004839bd6f09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384644/normal_5fe8f25247ca1.pdfIn PDF document text
    • https://kutobuxuvesoga.weebly.com/uploads/1/3/0/7/130740510/a0e86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476436/normal_601ee0c840ba4.pdfIn PDF document text
    • https://bazowumisobebu.weebly.com/uploads/1/3/5/3/135329866/5015992.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/wegemebufojafak/science_textbook_answers_grade_9.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_off0000d371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD371 5672 bytes
SHA-256: f9315afba4d84dcd28cb2a1fe306a7195e92e81020adb23f8943dad7913c3969
font_01_sfnt_off0000e6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AB 11028 bytes
SHA-256: d3b6085358d768b12ed73a30466052d1fe6496cbbb9ab365c16698a279f384c6

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