Malicious PDF — malware analysis report

Static analysis result for SHA-256 1095c56a4f6658e7…

MALICIOUS

PDF

72.2 KB Created: 2021-03-11 04:05:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e5d8b4ad7e370f11105526b71faa5c15 SHA-1: 3057b01f7bcbacc6c29ac1c9e4f0ba1aa0252233 SHA-256: 1095c56a4f6658e7bf3e8a955ad9f8da77c571307b625341f92deb2c75d1c2e9
226 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 designed to distribute malicious content or facilitate phishing. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the heuristic firings point towards the PDF acting as a lure to download further payloads, potentially via embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://xezojetit.ru/strik?utm_term=htc+m8+factory+reset+boot PDF link annotation
    • https://xuwowazasoko.weebly.com/uploads/1/3/4/0/134041707/2464830.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411229/normal_5fdef4e7534e9.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/gfZoehh/63006265593.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371267/normal_600bd0f1a761b.pdfIn PDF document text
    • https://cdn.sqhk.co/monubinejon/SgikifT/67838639859.pdfIn PDF document text
    • http://zodoworusa.22web.org/mitasedawejilabosemezoxe.pdfIn PDF document text
    • https://gatojodegapov.weebly.com/uploads/1/3/1/6/131637656/lidelaju.pdfIn PDF document text
    • https://mogisitubetaw.weebly.com/uploads/1/3/4/4/134496388/senitiditepolip.pdfIn PDF document text
    • https://cdn.sqhk.co/mifijizudi/hgwhaia/wimilotosulazuxokafapajuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413590/normal_6023d9f2a4f7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393514/normal_5fe8b56a3e0bb.pdfIn PDF document text
    • https://cdn.sqhk.co/wadupaxi/jg0bAhi/tiktok_followers_likes.pdfIn PDF document text
    • http://ramubananene.iblogger.org/nifipugodedopuwevorupurod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469863/normal_6001e1802c9dc.pdfIn PDF document text
    • https://ferizovewop.weebly.com/uploads/1/3/4/8/134887996/gunivuwawak.pdfIn PDF document text
    • https://cdn.sqhk.co/pawekenu/jujhifI/sofidoxemezobijiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_a19813defa5f4d268f8110f22f37ee11.pdf?index=trueIn PDF document text
    • http://sufotef.rf.gd/87916884616.pdfIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_ef4305fb0c3141a69104968a78a676c6.pdf?index=trueIn PDF document text
    • https://79e8b926-cc52-4cef-90ae-68e3990d752e.filesusr.com/ugd/694d5d_cbef98b30b3e40ed817020f2d31643ea.pdf?index=trueIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_cf201533755f4cee8155ca71aa5c29a6.pdf?index=trueIn 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_off0000de70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE70 5392 bytes
SHA-256: 1d4605f92ad876a0cdb2bd344600026de53b7074f78c9f56f87d865355125c67
font_01_sfnt_off0000f0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BC 10136 bytes
SHA-256: ff558b3378c8fbfc903e495285faaa2af2b909ae2731c549a5f686982a9622db

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