Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c5579aaddc1a3b8…

MALICIOUS

PDF

88.9 KB Created: 2021-05-05 12:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d4fb09d57d0f8c42e140fef247a9af16 SHA-1: 5097d692c542451f1dd38953a0204000a6446fc7 SHA-256: 9c5579aaddc1a3b8236f90d260c07c3b09ddfbe47c7ab2f461ed08a531b33eb4
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 0.9998

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://fokemale.ru/strik?utm_term=walmart+photo+coupons+codes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411708/normal_6024702c5fed7.pdfIn PDF document text
    • https://kivogumit.weebly.com/uploads/1/3/1/0/131070776/2dfd8aae21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374699/normal_603d2ea303b8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449411/normal_6066e08a9f7dc.pdfIn PDF document text
    • https://munejubulogulep.weebly.com/uploads/1/3/4/2/134266186/wojeliku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500679/normal_5fe7a29eaef5e.pdfIn PDF document text
    • http://zesegalos.scienceontheweb.net/gagodenogam.pdfIn PDF document text
    • http://robugipunebib.mygamesonline.org/lofotejujodipu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388052/normal_602a0f4a55cb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478133/normal_603fdda5b0afb.pdfIn PDF document text
    • http://pakekoramiduwin.getenjoyment.net/kuteduzibusazu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415782/normal_600c8fcbc8c03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465691/normal_5fde7573ae3d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411490/normal_601677c78773b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b03e51a8-7171-48c0-94d6-e4c032e6f37f.filesusr.com/ugd/9421c8_d8b802eadffd43c0b15cd490f771ed98.pdf?index=trueIn PDF document text
    • https://0b7b936c-93ac-4a60-9644-6ba220b934cc.filesusr.com/ugd/b4bf80_3295500fd06a4c2285ef3c803cad714e.pdf?index=trueIn PDF document text
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_94daa04adf6e413ab4f7de51af55f969.pdf?index=trueIn PDF document text
    • https://5090cb7a-f7dd-45b7-a4a3-960150b62b23.filesusr.com/ugd/dfd4af_6708766f44e640529c3deca41914a4d6.pdf?index=trueIn PDF document text
    • http://mawidinivetobi.myartsonline.com/business_english_presentation_exercises.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_off00011cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFA 5324 bytes
SHA-256: b35838ee7ff2c77bdabc7f608b03f0c8f4d7130eea814f40f9330aff2801553c
font_01_sfnt_off00012ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF1 11856 bytes
SHA-256: b0ef8fd1d9e2b34ddd19a011ba4b4dd005b7ca08e287a257d774dde7948bd871

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