Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e58c3a2481aeb91…

MALICIOUS

PDF

72.3 KB Created: 2020-11-20 09:49:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a69f76622acf3ad7b181dd577f53f620 SHA-1: d78c9f0f1768d9575e63f686e30270b1473fe0c5 SHA-256: 1e58c3a2481aeb91b3102c6a89d0b70f77c6acd208a34cb2308c8f7d2cbec3b6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, appears to be related to educational content, which is a common lure for phishing attacks. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/aws?utm_term=ncert+exemplar+class+6+science+answers PDF link annotation
    • https://zalawevovupat.weebly.com/uploads/1/3/0/9/130969727/tusutinekos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470689/normal_5fa7e46c5e9d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5f86f8931cc60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402953/normal_5fa5b630d9065.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480389/normal_5fada40648c16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428334/normal_5f9ad922b8060.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/39145045172.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/68566477044.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/87363743895.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/nitimobeb.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/dvd_to_mp4_converter_fast.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_off0000d0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AC 5040 bytes
SHA-256: 2eb8a429f769ac5963dd7b959ec01fd117c8b14ee42b8dc6196f7a2f53e58e6d
font_01_sfnt_off0000e1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BD 10784 bytes
SHA-256: 1e447a9f025e404eaca41b7708c454e9118c2884926b23d5163797df7ac37b84
font_02_sfnt_off0001065a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065A 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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