Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9db5532b84cd58f…

MALICIOUS

PDF

74.1 KB Created: 2021-02-28 11:45:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 8a0bbfc6e75dbad5933ca6db37645508 SHA-1: 72884ec23f42f012294c808305c29ae18c52b598 SHA-256: a9db5532b84cd58fe0950e77c91e8d0075c778953f0438c9f7a00a6eed7cd286
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, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a malicious document designed to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/strik?utm_term=pro-sumer+power+ebook PDF link annotation
    • https://morurotefat.weebly.com/uploads/1/3/4/3/134317018/3107940.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483851/normal_5fffe49b629c5.pdfIn PDF document text
    • https://fabisinutufonos.weebly.com/uploads/1/3/5/9/135993578/85fb11b9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386330/normal_5fe742a8064fa.pdfIn PDF document text
    • http://gmetry.online/la_finance_pour_les_nulsv8lwe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493195/normal_5ff347c4d4d2f.pdfIn PDF document text
    • http://discout.online/cha_cha_chat_appqfho2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419206/normal_6035806ec708a.pdfIn PDF document text
    • https://nodekisoguzila.weebly.com/uploads/1/3/5/3/135313862/xuwisuwetufasal.pdfIn PDF document text
    • http://erogan24.website/919035614935ropc.pdfIn PDF document text
    • https://toxosujaduwo.weebly.com/uploads/1/3/0/8/130874389/6503489.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447878/normal_5fe8a57cacf3b.pdfIn PDF document text
    • https://malotote.weebly.com/uploads/1/3/4/8/134872882/1997150.pdfIn PDF document text
    • http://allerop.xyz/black_and_decker_food_processor_fp4200b_partsw0od0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375528/normal_6025fb79aef02.pdfIn PDF document text
    • https://vefamomapebimid.weebly.com/uploads/1/3/1/4/131406391/78b5f2a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458829/normal_602e406506a5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485435/normal_5fe9ec7b8957d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412394/normal_5fcb339f2d80a.pdfIn PDF document text
    • https://vizokajobekaxa.weebly.com/uploads/1/3/0/9/130969885/guvizokerede.pdfIn PDF document text
    • https://rizogogitire.weebly.com/uploads/1/3/5/3/135323834/duzaterawezig.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_off0000e802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE802 5052 bytes
SHA-256: d8d8cf63852404194a96af4f7b6a876cec4410702db3c3eedc3993b000c50e57
font_01_sfnt_off0000f935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF935 9988 bytes
SHA-256: f3c9dd90d2bc7fd6ac644df5250405e2d88e01ff9695fa38a3ce9f06f647a217

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