Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b68db9ae1c8458b…

MALICIOUS

PDF

91.3 KB Created: 2020-12-10 19:09:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3da7c9a4dbf7a66d24d91a17be73ab83 SHA-1: 5a6c94c294b2512116fa03258a9cdec8f87f6ea1 SHA-256: 2b68db9ae1c8458b11f77e3da96f1605a8ec9cb1ac82035b03cfdf9142affdb9
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/123?utm_term=heart+of+darkness+analysis+and+summary
    • https://cdn-cms.f-static.net/uploads/4374956/normal_5f926ca0ad2c1.pdf
    • https://zezevibowavaki.weebly.com/uploads/1/3/4/8/134854125/pujenezukagu.pdf
    • https://cdn-cms.f-static.net/uploads/4416144/normal_5fbcb282c53ee.pdf
    • https://cdn-cms.f-static.net/uploads/4408176/normal_5fabd30a40ec3.pdf
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/8626484.pdf
    • https://cdn-cms.f-static.net/uploads/4365612/normal_5f885408d8037.pdf
    • https://static.s123-cdn-static.com/uploads/4374021/normal_5fca6a5812d29.pdf
    • https://xakukanezo.weebly.com/uploads/1/3/4/8/134898234/2b8dd7fc.pdf
    • https://xejapekedom.weebly.com/uploads/1/3/4/8/134864907/9c51c7c4.pdf
    • https://ximewenidurap.weebly.com/uploads/1/3/4/6/134651426/5171c98d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zabevog/10158708801.pdf
    • https://s3.amazonaws.com/tosevud/abrsm_strings_syllabus_2020.pdf
    • https://uploads.strikinglycdn.com/files/d4f68464-bb77-428f-890f-e36b4350d57f/daikin_aircon_remote_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000127f0.bin
72f3b07703255ea00710f77dfab4eb04899206e73a81827962039d74e18ed61b
pdf-font-stream PDF embedded font (sfnt) at offset 0x127F0 5180 bytes
font_01_sfnt_off00013989.bin
6fb86b4854dfe2fb27aa7d5d546f773a25e10260ba62289eecf9df458ed9ee96
pdf-font-stream PDF embedded font (sfnt) at offset 0x13989 11704 bytes