Malicious PDF — malware analysis report

Static analysis result for SHA-256 894457454dce9043…

MALICIOUS

PDF

68.2 KB Created: 2021-01-06 07:15:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3effe662c2ace8c8242be694ea2b2e17 SHA-1: b07eb170a821837040069a1025eb1983d08c0e3b SHA-256: 894457454dce9043f828b8596c28fa474226d9fb364f52504c7440edc8f73f7c
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs, many pointing to external PDF files, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection further support its malicious nature, indicating it likely serves as a lure to malicious websites.

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://gettraff.ru/aws?utm_term=ralink+bluetooth+pcie+adapter In PDF document text
    • https://static.s123-cdn-static.com/uploads/4369508/normal_5fd03e0d53443.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414687/normal_5f9b67fcccc81.pdfIn PDF document text
    • https://fijefozumomaba.weebly.com/uploads/1/3/4/4/134491855/4683445.pdfIn PDF document text
    • https://giwelexe.weebly.com/uploads/1/3/0/8/130814055/feberopovase.pdfIn PDF document text
    • https://gukijofajileraw.weebly.com/uploads/1/3/4/3/134392650/3d1ced3a2ddbc9.pdfIn PDF document text
    • https://zonotilikoper.weebly.com/uploads/1/3/1/0/131071062/6697247.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418000/normal_5fdc496d3ce90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380675/normal_5f8ffb01df796.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370074/normal_5fb5a3f28a76f.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/jodabiladezot/didn_t_answer_in_spanish.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_off0000cea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA8 5192 bytes
SHA-256: b43e92fb48ad4d94a2a3b2f1d4831597620f4fb38c0449598445199cca674b83
font_01_sfnt_off0000e049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE049 10716 bytes
SHA-256: ca3e76ea9c2390226082e8ca37754e5048f5d4806222b24e3b535b0057e0d972

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