Malicious PDF — malware analysis report

Static analysis result for SHA-256 d331a0b4cdfdb13f…

MALICIOUS

PDF

73.0 KB Created: 2020-11-21 03:16:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7b603f3f2754b7e26db6221c956051aa SHA-1: e9d5449a8eaefa76632ccbd06223364ba79f078c SHA-256: d331a0b4cdfdb13f68c107eceddcf57f52aee2bd849f9d0136781eb34da9d461
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains numerous embedded links, with one identified as a malicious redirector. The heuristic firings indicate a PDF link farm and a critical ClamAV detection for a phishing trojan. The primary attack pattern involves directing users to potentially harmful external sites, likely for phishing or malicious content distribution.

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://traffmen.ru/123?utm_term=exponentes+y+radicales+ejercicios In PDF document text
    • https://fitakizegeva.weebly.com/uploads/1/3/3/9/133999514/dudapomedeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444113/normal_5fa07a7d371d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388067/normal_5f8e3cc9609fb.pdfIn PDF document text
    • https://xawiwewediwo.weebly.com/uploads/1/3/4/0/134017039/4648db5.pdfIn PDF document text
    • https://zobimodajozo.weebly.com/uploads/1/3/4/3/134340865/6f5016824fdba8.pdfIn PDF document text
    • https://fidevawane.weebly.com/uploads/1/3/0/8/130814252/zixudotanase_kolelibisowafi_kogujegimipole_pigebemoxije.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/215d989b-e941-462d-8f56-fa14a046c524/81598181336.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21053e0b-4722-4e78-8d43-a8084c884dba/wuditobuxesuparoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc6d62f1-f089-4196-9f93-f438c2422d00/gangster_vegas_apk_free_download_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fd03582-7890-4b6b-b7b4-dd4782ed5821/60708208845.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/gilozesaxanujoxepegimisi.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/xobugazab.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_off0000dc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4B 5272 bytes
SHA-256: 6d2c1bacaeefd281b1f6632d0c3b3dc4e1e2e7dfac69eb14ceb4717804988bfa
font_01_sfnt_off0000ee54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE54 12064 bytes
SHA-256: 1f1f0a4f3ad86e024db5996db9fff7139e1c7b851efb9ac72f34efe8eab431bc

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