Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8394595dceb3b6b…

MALICIOUS

PDF

87.3 KB Created: 2021-06-04 16:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e1f2d9fbd882ed5f8b89c22a446b2445 SHA-1: eaa00b08b4d2ed81f9196517471d99c096d4d752 SHA-256: f8394595dceb3b6beb77a6370d61f01c27ac2d3b488682261d5eeacee94fb2ce
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-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://zajinet.ru/123?utm_term=baishe+srabon+full+movie++utorrent PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4394066/normal_60620dbb7474a.pdfIn PDF document text
    • https://bupaduzisi.weebly.com/uploads/1/3/4/4/134475958/tifomugonobe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446500/normal_602e0bd57512c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404725/normal_601e3e26dcf9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382631/normal_5fd26fc137d22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379491/normal_5fe35a5774916.pdfIn PDF document text
    • https://xilizotuxepaxi.weebly.com/uploads/1/3/4/3/134309236/napaviruzoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403688/normal_602b45b2ab44d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409254/normal_5fcbd4789eda7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482853/normal_604eb0784c746.pdfIn PDF document text
    • https://kotugupevexaxis.weebly.com/uploads/1/3/4/4/134493549/bejoralu_jisafiduri.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/b02c4a4d983.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380403/normal_5fffc6452909f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wigiwopajuke.pbworks.com/w/file/fetch/144595755/lumap.pdfIn PDF document text
    • http://wenitat.pbworks.com/w/file/fetch/144546471/anger_of_stick_5_apk_day_hile_indir.pdfIn PDF document text
    • http://sozevupegufi.pbworks.com/f/84782965128.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EB 5256 bytes
SHA-256: 374ace85bdd44b9590b851816ef50641fd3cc5cff2950ad382e13fc5c261f3bf
font_01_sfnt_off0000f8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A4 16428 bytes
SHA-256: e29a658fe177816f4d3f16f64440d7379fe6865f3013acc74478c6b016cd0296
font_02_sfnt_off000129c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C0 10660 bytes
SHA-256: 599eb2206c96cc57d033ae176b3ab0ebfc6717672c91804328baecf642e46495

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