Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d4bed11754bae8…

MALICIOUS

PDF

68.7 KB Created: 2020-12-19 01:21:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 93792bc49c4ad158fb771dc613299e7f SHA-1: 191fa4e4847624d712ad56dc9fa5027aa4c2f7fe SHA-256: 42d4bed11754bae8599c70a319b783d3d394a39f542d9e5963228e0b1dda5a05
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, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. One of the primary external URLs is `https://trafficel.ru/strik?utm_term=i%2527m+reading+books+of+old+lyrics`. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to 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://trafficel.ru/strik?utm_term=i%2527m+reading+books+of+old+lyrics PDF link annotation
    • https://jowesezowu.weebly.com/uploads/1/3/4/3/134366841/terafirajoperi-labejake-zabazewu.pdfIn PDF document text
    • https://nudopimiga.weebly.com/uploads/1/3/1/0/131070212/ab1f483aa51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376103/normal_5fbd57a8528b0.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/duzexefemosaxe/jepenefopalajalubodugasij.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/75337856357.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50662352-a02b-4ca6-a728-98b890943475/rijigakavo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2df6786-c173-4c84-8cb5-d8fd86c91133/suwosetotevuvovemu.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/warelamawikukarijiferalu.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/large_printable_dice_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4986216-e42e-43d1-a774-4311949835c0/ruxunizuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d4e5152-0cdd-4900-a36c-26f2b9307416/82492221402.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8065d09-19e8-481a-a7c9-a55a44e105d3/nasup.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_off0000d073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD073 5616 bytes
SHA-256: 655ef839589343cd5051aa3ab1ffc82c16966e4b473c56644f5a38feaf5c3527
font_01_sfnt_off0000e398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE398 9996 bytes
SHA-256: 3bd9809069e84dd3bc98a232e46945c01e46b6c72fd32131071affbefdbfe89e

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