Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f9f0c3cc0bcf1f6…

MALICIOUS

PDF

78.3 KB Created: 2021-03-18 10:56:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 35570fe9cc25cf2d25cb160e808a0689 SHA-1: 11e1e15902c1eb65d95df650d670a16fd2ced987 SHA-256: 8f9f0c3cc0bcf1f63ae2e18442bb5dc469c5b938a3f6aea4ace4cda007293868
156 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 0.9993

Heuristics 5

  • 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.
  • 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/award?keyword=functions+and+formulas+in+excel+2020+pdf PDF link annotation
    • https://vetitigozep.weebly.com/uploads/1/3/1/4/131437709/4b209.pdfIn PDF document text
    • https://fokomawirofuteb.weebly.com/uploads/1/3/0/9/130969657/8770986.pdfIn PDF document text
    • http://sunakijabe.sportsontheweb.net/lefawijugoralijubimaro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403687/normal_5ff64bb1ebcde.pdfIn PDF document text
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/a47085c1b7ed744.pdfIn PDF document text
    • https://kasikijafeke.weebly.com/uploads/1/3/1/4/131406722/3c6088290.pdfIn PDF document text
    • http://kujamemapevubu.mypressonline.com/vovovege.pdfIn PDF document text
    • http://ketenimolupev.sportsontheweb.net/vidadukapejezudawonab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459921/normal_5fd7eb94d43d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379626/normal_6016c504d29e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365562/normal_601716fbbdf5c.pdfIn PDF document text
    • https://xasonametig.weebly.com/uploads/1/3/2/3/132303127/5388735.pdfIn PDF document text
    • https://popetufuwude.weebly.com/uploads/1/3/1/4/131483025/donarajunimotes_tameger.pdfIn PDF document text
    • https://gavebinakufir.weebly.com/uploads/1/3/2/3/132302735/tonemozevopala.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://namepafubi.atwebpages.com/disaserazuf.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/criminal_justice_reform_jobs_philadelphia.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/xevugig.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/81751077322.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/insertion_order_template_online_advertising.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/vobutiwazasi.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/gore_tex_gasket_sheet.pdfIn PDF document text
    • http://filosoko.onlinewebshop.net/easy_piano_songs_pop.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/53203541454.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_off0000efa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA5 5600 bytes
SHA-256: 8ef9e4e86d616e0363888be9c9b81101f2306ef48876b3d2008c55e64f6d437c
font_01_sfnt_off000102a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A7 11600 bytes
SHA-256: 92c1ac4062a34fd3e260183bfb80e16ae5cf26c7272e0a37bec6820a965317fe

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