Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b4d17f615d05d8…

MALICIOUS

PDF

72.0 KB Created: 2020-12-21 02:08:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e25460ec91037d0f2264d1aebb4bed92 SHA-1: 92cd13b39b1530ac125276beae5735114fa6c63f SHA-256: b7b4d17f615d05d8ee07db90aef7bb43be82652a2e146b71cc45af35498893e1
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with the primary link directing to a known malicious redirector. The heuristic firings indicate the PDF is designed as a link farm, likely to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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=basanta+utsav+song+video In PDF document text
    • https://debuvubuni.weebly.com/uploads/1/3/4/8/134846467/766ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460071/normal_5fd8cedf95962.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464700/normal_5fd720d0e0712.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420589/normal_5fdcc20399ff8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452609/normal_5fc0b3325ff12.pdfIn PDF document text
    • https://nodemexawek.weebly.com/uploads/1/3/4/3/134331915/75913df4438c9c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426071/normal_5fc0c99a6eb99.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/vatakefojunib/47499495273.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/chyawanprash_video_song_full_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/catia_v5_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/dragonfable_technomancer_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/section_11523_of_the_government_code.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8B 3460 bytes
SHA-256: 0e6e61a136499d7b4a01bb83c556d69c2bfc7e0054d0c1e56305dc5a0dda47c6
font_01_sfnt_off0000dbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEB 4972 bytes
SHA-256: 7080c65fa661bcae849033a5055a088b9c07171f34c921a4a756870f9f0ff604
font_02_sfnt_off0000ecf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF0 11276 bytes
SHA-256: 8077efd4afbc9f5158fda81e93a2a47447e44c935b3a32629a7fd5ae0bd4ec41

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