Malicious PDF — malware analysis report

Static analysis result for SHA-256 023c253f60c758f2…

MALICIOUS

PDF

69.5 KB Created: 2020-11-14 02:49:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 3ae310018baf433bc77c1a42b1dfd772 SHA-1: 1d8e4e32b1be5fea42ec8b9ba0d884ce41e8d6d6 SHA-256: 023c253f60c758f2424ad4ad05703275f9cade7cf6d621f96ae24dbc989613ce
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a "mass external PDF link farm." The document body, though heavily obfuscated, contains text related to "shower enema directions," suggesting a lure to direct users to potentially malicious websites. The presence of external URIs and the ML classifier's high confidence score indicate a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://trafffi.ru/123?utm_term=shower+enema+directions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423429/normal_5f9b10ff871ea.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/1109957.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376856/normal_5f8fa7882370c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382421/normal_5fa7e6f6bb0cb.pdfIn PDF document text
    • https://subefivu.weebly.com/uploads/1/3/4/6/134688636/3e966278f7a8.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/zategafozasiru/skyrim_flawless_sapphire_temple_of_dibella.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/biochemical_pathways_roche.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/acing_the_new_sat_math.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ccf5916-c8f3-4d47-8e39-b42759bddec3/60109936355.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/3362172791.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/muzugatikagokusuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efb07d50-7e5d-4810-b8e2-627a03ee14e2/50449459375.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_off0000d266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD266 5344 bytes
SHA-256: 360bab4160697bfc7770f03e7a7d10889687e987e468d4e6a8f20cc7104b0074
font_01_sfnt_off0000e470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE470 10344 bytes
SHA-256: ead5671d0fa62a9af57ef153be8a6f842e53bbc3731d5720a2c602b785e45ebc

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