Malicious PDF — malware analysis report

Static analysis result for SHA-256 04540467f4ec3ad2…

MALICIOUS

PDF

90.3 KB Created: 2021-06-06 17:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 0b37e30548a64d3c4093e4c91a51fe8d SHA-1: 9056644436c63f454f0f84adf5033d17fd696da1 SHA-256: 04540467f4ec3ad28a08e24736cf3d176a39be08d044eb6daf57d1353585939f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://huntic.ru/pbw?utm_term=s%25C3%25ADmbolos+celtas+significado+ancestral PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470689/normal_604f55e097b17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405650/normal_6069123cd6368.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403259/normal_60b94ee0be49d.pdfIn PDF document text
    • https://tudanane.weebly.com/uploads/1/3/4/5/134596872/gabegik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479942/normal_6000ff53a9adf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452386/normal_601bae2785402.pdfIn PDF document text
    • https://tiwozujipi.weebly.com/uploads/1/3/5/3/135317022/fazowiv_vitigiwakavab_pizuxiva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368505/normal_60bca21761801.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484156/normal_600bc75ace4ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424997/normal_5ffbc881a6596.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494866/normal_60323324c63f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425230/normal_60126ac7b114d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484169/normal_6061c20b6ee4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365627/normal_604f1ecf6aace.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366014/normal_5fdcea59a9ad8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368751/normal_605f2cdda25aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383912/normal_5ff53443e41f3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rawumadakora.pbworks.com/f/nuxidi.pdfIn PDF document text
    • http://nagaxop.pbworks.com/w/file/fetch/144541620/kudikabulolugomokumaxab.pdfIn PDF document text
    • http://wesupumus.pbworks.com/w/file/fetch/144712365/40493446989.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/w/file/fetch/144442962/88183465752.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_off000121a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A7 5636 bytes
SHA-256: f9718e42417b78d3e804dbfc38f68c7b4c124146512bd2c04533e6c7ebb15e78
font_01_sfnt_off000134c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C0 11448 bytes
SHA-256: c63c05db2bc81f1c68f5264c0c211b152d4f56dee912120c9e05d4552056302d

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