Malicious PDF — malware analysis report

Static analysis result for SHA-256 53643f141b5ce087…

MALICIOUS

PDF

71.1 KB Created: 2021-01-03 14:14:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ecf6d03bd8875d8b6b0150cb221314c7 SHA-1: 7ca4d032f86d05903716f197f16cca93cac9fbbe SHA-256: 53643f141b5ce0878fb5d539bb042ff983ef9455a853f6c8c0f9dc4da5642c89
214 Risk Score

Malware Insights

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

The file is a PDF containing a high number of embedded URLs, with critical heuristics indicating it's a malicious redirector and part of a link farm. The ML classifier and ClamAV also flagged it as malicious, specifically as a phishing trojan. The presence of numerous links, including one pointing to known malicious infrastructure, strongly suggests a phishing attempt or a campaign to distribute malware via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=broadsheet+fitzroy+brunch In PDF document text
    • https://dokojivoko.weebly.com/uploads/1/3/4/3/134395563/tijonodomamidem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413019/normal_5fc864a0cbb9b.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/ff999590-17b4-4fea-8776-32135bc86bd6/41585326138.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5979f5b8-fd7d-4287-8f83-3960f17cc652/57351942567.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9c40ae6-f10f-4542-a2d4-82989debbe2c/descargar_tzar_anthology_espaol_mega.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/59436250332.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a98e3c2d-601e-4f2a-a6a0-e9d6a24a4cc6/words_with_j_and_q.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f99ce6e1-96cb-4106-bbec-dde1094cd739/destiny_2_nascent_dawn_4_5_cache.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dfa235c-1cf0-4ef9-961f-965e36490583/498414624.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/the_blind_girl_short_story.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_off0000d920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD920 5420 bytes
SHA-256: 783699a33684e0e8e6848c8c434691b62489d2ecaf7b9a828a9048c76b2dbf6a
font_01_sfnt_off0000eb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB99 10820 bytes
SHA-256: fcb04ec37836df373f64bca1b67eb6fec42cf4ba278e391fdf16d2ea5147f038

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