Malicious PDF — malware analysis report

Static analysis result for SHA-256 22a76f0d70c14783…

MALICIOUS

PDF

79.8 KB Created: 2020-11-19 22:48:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a1cddd96add4ddceea9a62b377cda5b SHA-1: 1b1f5ca8f6a833d3278dff5b488c0065ac785e47 SHA-256: 22a76f0d70c14783730d9d330309688841df0b604be40031bf21620f95620771
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external links suggests an attempt to manipulate search engine rankings or direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cctraff.ru/123?utm_term=fellini+roma+script
    • https://cdn-cms.f-static.net/uploads/4468571/normal_5fad2b318d915.pdf
    • https://cdn-cms.f-static.net/uploads/4370528/normal_5f8a039e92eb6.pdf
    • https://solujokorox.weebly.com/uploads/1/3/4/1/134108712/73156.pdf
    • https://cdn-cms.f-static.net/uploads/4384825/normal_5f9fa67820139.pdf
    • https://cdn-cms.f-static.net/uploads/4379984/normal_5faf11e3d57ab.pdf
    • https://cdn-cms.f-static.net/uploads/4393761/normal_5f8f3cf465de0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jedobufudajewu/dujolimeluxuzivanaziteju.pdf
    • https://s3.amazonaws.com/nitajosasa/42009306071.pdf
    • https://uploads.strikinglycdn.com/files/d2f97a1e-6b3a-40d5-8bc6-ae7e0f555130/kezixutufuvidep.pdf
    • https://s3.amazonaws.com/muvarelo/marion_elementary_school_st_louis.pdf
    • https://s3.amazonaws.com/tesasubawalozan/transformers_fanfiction_prowl_decepticon.pdf
    • https://s3.amazonaws.com/vuxalirudidel/4153065612.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_off0000fecc.bin
57c27486520b61c3e86d9cc0c788b495463e59bcd64480f1d587435944f81acb
pdf-font-stream PDF embedded font (sfnt) at offset 0xFECC 5032 bytes
font_01_sfnt_off00010fd1.bin
e0ee21252ba7102f0b7393009414dd54e0656d1b1473bfad4a5d1cdee05aa92c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD1 10392 bytes