Malicious PDF — malware analysis report

Static analysis result for SHA-256 5974e9746c1b2175…

MALICIOUS

PDF

84.5 KB Created: 2020-11-24 15:58:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 87ea566acdf55be2c387237ec84b522c SHA-1: 93c85f22d34c393f178bfc3fab1dd090ba3fe259 SHA-256: 5974e9746c1b217590836f1d2ad0c4531d28a2dbaeb341d3c9f6ea6491784425
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous external links, with one prominent URL pointing to 'trafftec.ru/strik'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent, likely to redirect users to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • 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://trafftec.ru/strik?utm_term=hit+or+miss+girl+gif PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374954/normal_5f9cb29a8702a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468871/normal_5fbc1848a24d7.pdfIn PDF document text
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/2042473.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5f875bc6588ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366336/normal_5f94831d5b6bb.pdfIn PDF document text
    • https://nusutena.weebly.com/uploads/1/3/0/7/130739474/nuwuza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369310/normal_5f931dcd65ff0.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/zoniji.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/guwutivupudutu/18868681908.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/32156495513.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/wezav.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/davizerap.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/koruwamisisezosijesaweka.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
    • 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_off0000b4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D1 6424 bytes
SHA-256: 50759c40df67ec181331d37bc16259f4db20c39507a2c7d18444f96545433770
font_01_sfnt_off0000c4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B1 4840 bytes
SHA-256: a900d35277d38b3960eaf23b2ff40886f8049971b51cfcab3578519d8a667b7b
font_02_sfnt_off0000d50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50D 14432 bytes
SHA-256: 1d68232e2085399103d3876d53be89d5ca2d3bc8a719b0e9e0050377548b97e5
font_03_sfnt_off0001014e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014E 10804 bytes
SHA-256: dad1d0902a98ad990172800844c6219b63c7e7d85fc9ed374e5fe155d70d9a4d
font_04_sfnt_off000125cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CB 20828 bytes
SHA-256: c876dcd835990a6fe1b29eb8506d684df460eb13555cac95aede014a1fc604a7

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