Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c44de4ff1ed1a6…

MALICIOUS

PDF

64.3 KB Created: 2020-11-10 01:01:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f437228545342c5ce2749c935241bd3c SHA-1: 39525426519d99f6de351cb556a0df9ed8d07372 SHA-256: e4c44de4ff1ed1a6020f54d33dca74d6294fa663fb8063fa4ccd4f02a5c93bb1
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://traffset.ru/123?keyword=big+paintball+script+esp PDF link annotation
    • https://kizofupotumi.weebly.com/uploads/1/3/4/3/134314367/funatawufe_komutinit_guxukumonof_somarurukaleni.pdfIn PDF document text
    • https://toleminifuf.weebly.com/uploads/1/3/4/0/134017029/9a3ff84e8.pdfIn PDF document text
    • https://repugonajipivup.weebly.com/uploads/1/3/0/8/130814926/4877954.pdfIn PDF document text
    • https://mojipodo.weebly.com/uploads/1/3/4/5/134592530/5017614.pdfIn PDF document text
    • https://kivuligob.weebly.com/uploads/1/3/0/8/130874143/zuronuvef_bazakulanigipe_bofufuvup_xininideweruve.pdfIn PDF document text
    • https://matubupediguja.weebly.com/uploads/1/3/4/1/134131452/jufigulaxujonajasonu.pdfIn PDF document text
    • https://pawusimogi.weebly.com/uploads/1/3/4/4/134444718/6910107.pdfIn PDF document text
    • https://winuvepesedop.weebly.com/uploads/1/3/4/4/134476249/bovono-toxaxerimij-nozus.pdfIn PDF document text
    • https://pudafakomixi.weebly.com/uploads/1/3/4/5/134506615/sobipazufil-jixofipej-gameje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413867/normal_5fa6b2077b284.pdfIn PDF document text
    • https://vakasuvarepem.weebly.com/uploads/1/3/4/3/134328097/jufulisufakap.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/zamuriza/pathology_bangla_book.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/chain_reaction_game_show_2007.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE4 6548 bytes
SHA-256: b27c7a011d1e25a8740c16753f32df49003034e6b6973e84691b1598814ca5e7
font_01_sfnt_off0000bf3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3A 5292 bytes
SHA-256: 4ceaeaf912067c2b7ad343f6ed1f6483c347e78e37d4597d4c68d26e209920c2
font_02_sfnt_off0000d147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD147 10208 bytes
SHA-256: 03dbcf5b55a8f63e8adbe5ba0062ab5645bb57ea3a5efb6226d2d97371c43115

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