Malicious PDF — malware analysis report

Static analysis result for SHA-256 79db6f470fc4c1c1…

MALICIOUS

PDF

80.1 KB Created: 2021-02-26 13:49:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: daba59c8bd7fc09567afbca378da0b08 SHA-1: 55c04ca5cf53451efae1e0b47d986a896ff2fd11 SHA-256: 79db6f470fc4c1c120d114dd3f92407b06a68e6914729aae2215b0cb9686e6b6
186 Risk Score

Malware Insights

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

This PDF file functions as a link farm, containing numerous external URLs pointing to disposable hosting services. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious sites, potentially leveraging techniques like T1059.007 if JavaScript were present, or T1566.001 as a spearphishing attachment.

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://lozipotod.ru/wix?keyword=animal+crossing+happy+home+designer+change+furniture+color PDF link annotation
    • https://bopisigo.weebly.com/uploads/1/3/1/4/131453919/dapomegavaxono.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/6e45109b9.pdfIn PDF document text
    • https://botabire.weebly.com/uploads/1/3/4/6/134629411/1e9889bc05b921b.pdfIn PDF document text
    • https://murarukaxew.weebly.com/uploads/1/3/4/6/134666391/f45f5.pdfIn PDF document text
    • https://gekiwudev.weebly.com/uploads/1/3/4/7/134769606/rutukebedu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483088/normal_5fddda23ef5d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464996/normal_5fca079835a03.pdfIn PDF document text
    • https://gexemuxu.weebly.com/uploads/1/3/5/3/135394015/f305a8aaf0631b.pdfIn PDF document text
    • https://fufaguda.weebly.com/uploads/1/3/0/7/130739251/9788e4d8a9fb3.pdfIn PDF document text
    • https://gokepitamewema.weebly.com/uploads/1/3/5/3/135325242/fe369da2bb45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491670/normal_5fd2e35150217.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459914/normal_5ff0d85b76317.pdfIn PDF document text
    • https://jopixumux.weebly.com/uploads/1/3/4/7/134734794/fae3bd857c459df.pdfIn PDF document text
    • https://tofavasexivefet.weebly.com/uploads/1/3/4/5/134578877/d8209.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zotubune.myartsonline.com/cognitive_dissonance_effect_definition_psychology.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/39442841823.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_off0000fafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFC 5660 bytes
SHA-256: c38c969bedd17fe5c370bcac7a5dd229cd7b0c42d4873e15e770c7796c7ba78a
font_01_sfnt_off00010e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0E 10744 bytes
SHA-256: 0a58052905216c784b8b64d78ef230e3eedb73bf788a5222cb0f58150255a3b7

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