Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ae38a27f5760df…

MALICIOUS

PDF

69.0 KB Created: 2020-12-13 21:51:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1ef240a04f707b809545d46943b5676d SHA-1: c6deeb1bcef45f5919f1f7a7d5582423ce0f3b74 SHA-256: 37ae38a27f5760df824de7bb2cffeb39e8ad634debb26ef456b1cc9b769bea38
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector pointing to 'ggtraff.ru'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm designed to manipulate search engine results or distribute further malicious content. The ML classifier and ClamAV detection strongly support the malicious classification.

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
  • 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.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=novak+djokovic+latest+news+bleacher+report In PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/bavajedagigubupa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408197/normal_5fa984711c4bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489615/normal_5fbe57849b6af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421472/normal_5fcb03478e8ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366351/normal_5f873cdd40db6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387939/normal_5f94012dbfadc.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/vabedafozo/81832818510.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbf0fa9d-c234-47d6-aa2c-6f1c3b21ca0a/fisiwe.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/zulotekisejatisovadivej.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/ancient_egypt_map.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/jowejikoduwerojaveferotim.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/jatab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcbffc32-777b-45c9-94b1-ff3860885fb4/doderekuvu.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_off0000cf54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF54 5560 bytes
SHA-256: 22de468f0d322bdfe2e6affe58261e9d9058b2126ccb16bf305590d96b4ebddc
font_01_sfnt_off0000e24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24E 10760 bytes
SHA-256: b98107078f62968781030618c2217e6b6fbfe4f9c7c825051ed704569a5aff4a

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