Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2caa4e5aa57794b…

MALICIOUS

PDF

77.9 KB Created: 2021-02-21 11:57:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 38eb61e83182e4d1519bf057d6d23501 SHA-1: 3df840578ed0f31092b1d33c76d4207d6d242911 SHA-256: c2caa4e5aa57794bc34301723fdda697fb4e3d7039270141827cdf85f3fa8a89
186 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 hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/strik?utm_term=how+to+draw+a+realistic+braid+step+by+step PDF link annotation
    • http://gevixadita.22web.org/happy_wheels_ios_levels.pdfIn PDF document text
    • https://cdn.sqhk.co/ferobisuw/igdEAjf/candy_crush_saga_download_for_pc_filehippo.pdfIn PDF document text
    • https://cdn.sqhk.co/vutexexukus/agjVjdu/45683530979.pdfIn PDF document text
    • https://risegutu.weebly.com/uploads/1/3/4/2/134265716/de64ad5e67ce94.pdfIn PDF document text
    • https://joruluzadazalit.weebly.com/uploads/1/3/4/6/134673717/9032143.pdfIn PDF document text
    • https://cdn.sqhk.co/gigijuke/j4dGi3X/insane_bike_challenges.pdfIn PDF document text
    • http://xebobimifu.22web.org/balanza_de_pagos_bcrp.pdfIn PDF document text
    • https://cdn.sqhk.co/nedupugifuka/PePjjM4/fegipad.pdfIn PDF document text
    • https://cdn.sqhk.co/nezotelo/WGhieLp/weird_and_wacky_fun_facts.pdfIn PDF document text
    • https://fiwudarive.weebly.com/uploads/1/3/0/7/130775392/xixinodozon-witanapaxeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://riwuzapivegeb.rf.gd/addition_with_regrouping_3_digits_worksheets.pdfIn PDF document text
    • http://pabaxonewopux.epizy.com/mixed_approach_research_design.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/foxazuliwanisenagujamabob.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/shankar_mahadevan_tamil_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/96856910434.pdfIn PDF document text
    • http://nidemavaguwagev.rf.gd/exercicio_de_botanica.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/75962251036.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_off0000f316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF316 5364 bytes
SHA-256: 125e945ac5ae801515c6a0ba2b90b4b38e65e35252b977093b98ccf461a3b270
font_01_sfnt_off0001056f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056F 10108 bytes
SHA-256: d97cbe3170b9467bc3510caaa7eab37cbaa5ac5228e90db603b9b6db7c13974f

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