Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cca3840acc82d2c…

MALICIOUS

PDF

84.3 KB Created: 2021-04-06 06:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1572d6b05ea17a742b4bc532d3745e39 SHA-1: ddc3b72809436f16eefa3a4256a374c64ae71cbe SHA-256: 8cca3840acc82d2c57979cb120f12a4dfba831fc1e34b7800fc7048efcd3efa2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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, suggesting a link farm or SEO poisoning tactic. The primary URL, https://mezovuduw.ru/strik?utm_term=why+isn%2527t+my+sound+working+on+my+vizio+tv, appears to be a lure for users searching for technical support. ClamAV and ML classifiers also flagged this PDF as malicious, likely a phishing or trojan delivery mechanism.

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://mezovuduw.ru/strik?utm_term=why+isn%2527t+my+sound+working+on+my+vizio+tv PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413112/normal_60425fe265ae4.pdfIn PDF document text
    • http://hookup754.fun/love_and_respect_conference_dvddunpc.pdfIn PDF document text
    • http://gomigapujasep.sportsontheweb.net/environment_and_ecology_shankar_ias_book.pdfIn PDF document text
    • https://kupikonawu.weebly.com/uploads/1/3/4/8/134882044/vedujevefolugi.pdfIn PDF document text
    • https://sidatotivokusud.weebly.com/uploads/1/3/5/9/135959985/leruvezuludo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473637/normal_601bdea291529.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/41483465772.pdfIn PDF document text
    • https://tagakokiginozol.weebly.com/uploads/1/3/0/7/130775172/8761873.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416661/normal_604ab1da2e1ec.pdfIn PDF document text
    • http://bitalotava.scienceontheweb.net/relewebomujurijaforoj.pdfIn PDF document text
    • https://fojowixejomad.weebly.com/uploads/1/3/2/6/132681658/1223111.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478685/normal_5fdbd861462de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467043/normal_5fdfa1d142011.pdfIn PDF document text
    • http://trastqort.online/506258270700iwju.pdfIn PDF document text
    • https://zoseduzarososu.weebly.com/uploads/1/3/2/7/132740870/ed361110fba7.pdfIn PDF document text
    • https://wusuritod.weebly.com/uploads/1/3/0/7/130739885/4915413.pdfIn PDF document text
    • https://mogorabijeruli.weebly.com/uploads/1/3/1/3/131380728/b383cdaeebf7.pdfIn PDF document text
    • http://difipalilif.scienceontheweb.net/who_malaria_treatment_guideline.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385617/normal_5fe295faf0ab2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B05 5412 bytes
SHA-256: 6fa30554f59ab46a7cc5708869edfcd749347a606710328dff1dd5cc3e5cb35b
font_01_sfnt_off00011d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D77 11328 bytes
SHA-256: e5ffcc5d2cb551412d43ae97fabd5ab665e02f6d11c3626346beb6679cf900f7

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