Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6407c4d23ae8eea…

MALICIOUS

PDF

80.2 KB Created: 2020-12-16 23:08:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: e0558f5b305cb8b4a78d9303f6b7efa2 SHA-1: de9ca072c608e113567af3635b3804cfb69a0daa SHA-256: c6407c4d23ae8eeac2aecf0600dbf2715daf19fed1d5332fddf99dba51f3cbf2
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 0.9994

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://trafficel.ru/strik?utm_term=realistic+water+2+ineed+patch PDF link annotation
    • https://ruwuzeget.weebly.com/uploads/1/3/4/7/134755445/9371724.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476580/normal_5fda6d0bde7a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370737/normal_5fd7de67707fd.pdfIn PDF document text
    • https://tixovokibena.weebly.com/uploads/1/3/4/1/134109053/jekokomutome.pdfIn PDF document text
    • https://xezagepu.weebly.com/uploads/1/3/4/9/134901129/zadazadew-majigi-xugaxavijozi-pirafivukezi.pdfIn PDF document text
    • https://sedezexe.weebly.com/uploads/1/3/4/3/134342112/xitexolonudifu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488809/normal_5fccfe187e1de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426830/normal_5fcd6c2c8b055.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365634/normal_5fb919748747a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489409/normal_5fb5485663b9a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/dac1fe1f-02ab-49d8-9723-08630d1d858b/44495049487.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/cathode_materials_for_lithium_ion_batteries.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b52500c7-0ee4-44cf-b72c-7dff8eed41e4/14464237597.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/99980710751.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.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79F 3048 bytes
SHA-256: f420e070023d2ccf0250fb14e69491c2b9539a168d71a452398abd66c82d02dd
font_01_sfnt_off0000d276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD276 5392 bytes
SHA-256: 85ca24d585f8b9eb811d6074307b1ddf4cceaa7da7b0c70aa4dd28b76ab595e6
font_02_sfnt_off0000e4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D4 6672 bytes
SHA-256: 765e3cb5cadb621d33ea7a7222d15fa3c0d569e5162638f8480fa976c4c096b8
font_03_sfnt_off0000f689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF689 12048 bytes
SHA-256: 6f27eaced20c88f3b2427a434367b441e66d965a25902a8ca8d541829724cf79
font_04_sfnt_off00011d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D84 16068 bytes
SHA-256: bff620efafd19347b267d395afbaf496ecd82cd7772b41387cd2beb5a1750540

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