Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ba0c8da705cec8…

MALICIOUS

PDF

69.3 KB Created: 2021-03-19 19:57:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 53eb9207f50b68fdbcbb2cdc0957cfbb SHA-1: f4f9fafb1aca75071bbfaca387d961b8a1e67e9e SHA-256: 70ba0c8da705cec8a7ce74423137c97deb23ad03c8df861cb51099abe4c1647b
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-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://ponafet.ru/strik?utm_term=what+is+the+intermolecular+force+of+ch3f PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393637/normal_601f9ed21798e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468812/normal_601fd1cc2dd0d.pdfIn PDF document text
    • https://pakosikan.weebly.com/uploads/1/3/0/7/130740558/3a3833c35.pdfIn PDF document text
    • https://federadedeladol.weebly.com/uploads/1/3/4/6/134626130/simopofikefonu-dofosokuli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412173/normal_60133042510ff.pdfIn PDF document text
    • https://murozukuzofapu.weebly.com/uploads/1/3/4/7/134716639/3950737.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403681/normal_601eabb728771.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445890/normal_6000484f51717.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387933/normal_5ffb6e6bc463f.pdfIn PDF document text
    • https://jikomaviwibu.weebly.com/uploads/1/3/4/3/134365837/5301701.pdfIn PDF document text
    • https://vemanilulo.weebly.com/uploads/1/3/4/3/134378365/gezofo-pezopofalikemik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390643/normal_601e25783ef31.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457590/normal_5fc94acb0f671.pdfIn PDF document text
    • https://giwemonuxir.weebly.com/uploads/1/3/0/7/130775654/depasoz_labodesagop_mamojek_nizoji.pdfIn PDF document text
    • https://pukogapuwobar.weebly.com/uploads/1/3/4/3/134307851/gilubigaferegum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/backuptrans_android_line_transfer_keygen.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/pubokasamapolu.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/17135816529.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/riwibenumo.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/book_cover_design_app.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_off0000d19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19A 5296 bytes
SHA-256: 48e2e5cd712002134346d0555f1e3b6785ccf02b21ff0f3c5ed211df7fdd85b3
font_01_sfnt_off0000e383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE383 9956 bytes
SHA-256: a536677ea4e6a4a23aaee5173e82a91744d184517be2b968d8e155bc0d484f5d

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