Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b4bcb1460f3b96…

MALICIOUS

PDF

68.1 KB Created: 2020-11-18 21:52:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: aef768fc4401cbffa485fd1c87ea3af9 SHA-1: b240ac51f1481710a7f8b5cac50e920281a2c4f7 SHA-256: 93b4bcb1460f3b96fa50f7a1328fd481ac2f58a1d328348755848809aeb56e7b
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on Weebly and appear to be part of a link farm. One critical heuristic indicates a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Catholic bible download', suggesting a lure to trick users into visiting these malicious sites. The presence of embedded URLs and the ML classifier's high confidence score support the malicious classification.

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://gettraff.ru/strik?utm_term=catholic+bible+download In PDF document text
    • https://tebuzanowazori.weebly.com/uploads/1/3/4/6/134632783/zurewireliwexilopo.pdfIn PDF document text
    • https://xakexoxos.weebly.com/uploads/1/3/4/3/134307698/jajerelarekotugako.pdfIn PDF document text
    • https://vitumiwoz.weebly.com/uploads/1/3/4/6/134697216/mupidovoj_biboxewelosor.pdfIn PDF document text
    • https://wejibuxod.weebly.com/uploads/1/3/0/7/130740202/628663.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426413/normal_5fa47f1af2f30.pdfIn PDF document text
    • https://romovemesokawaj.weebly.com/uploads/1/3/4/4/134479736/f289f696bae6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369165/normal_5f87a9a3ad161.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/bd3a482a-2815-414f-a221-2a1060e4875d/80770990987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04e17c7c-47a9-4d2d-8c19-3aae19d18d7c/puwuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f1a18db-1bda-4e69-a6ea-9c1fbe63d8bb/nanategizegajitafabawuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89889a7d-70e6-4d26-856f-d7a0c9c82286/30_circle_challenge.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A5 4892 bytes
SHA-256: a427ed5d743c891b659e79dc311c885e9878b81e53f2eadb3baa38b90128ce20
font_01_sfnt_off0000ca4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4E 10644 bytes
SHA-256: 537f9597b7bc211244d4a701bd5fd3a466c3d65dfc7c123d6d719c32e1f229d4
font_02_sfnt_off0000eef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF3 16036 bytes
SHA-256: 9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940

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