Malicious PDF — malware analysis report

Static analysis result for SHA-256 addf2a1f9a69728a…

MALICIOUS

PDF

73.8 KB Created: 2021-03-14 03:49:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: c342b31f52104659ca9b2ca364b34b5b SHA-1: 805755f6b64886cd46046152a3ba1f226b26e9ba SHA-256: addf2a1f9a69728a320a7ed93fc3d7f04b38bbf77da539b861e5606dffa69b18
186 Risk Score

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 0.9996

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://bologen.ru/award?keyword=asnt+level+3+study+guide+pdf+download PDF link annotation
    • https://jabenawonidibe.weebly.com/uploads/1/3/5/3/135385032/jukijogegojurigogaxo.pdfIn PDF document text
    • https://jiwazumirinupe.weebly.com/uploads/1/3/4/3/134352382/6505687.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476564/normal_603175a6c0b6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367278/normal_60410d2fc0c80.pdfIn PDF document text
    • https://ruginimurixibiz.weebly.com/uploads/1/3/1/6/131606491/saragidi.pdfIn PDF document text
    • https://zasevolonuto.weebly.com/uploads/1/3/5/3/135335071/965e5a.pdfIn PDF document text
    • https://jupiretuvivu.weebly.com/uploads/1/3/5/3/135383394/3196566.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465690/normal_5ff1b35f51274.pdfIn PDF document text
    • http://juvulirodesowe.22web.org/information_about_ben_10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://247e77cc-5367-4382-8586-7c5891409f42.filesusr.com/ugd/2dbf5a_3e141f396def49dda27cfc04e1fc7b51.pdf?index=trueIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_5251fc8e446b42ea809d453dd3622128.pdf?index=trueIn PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_fedd60d332114a56a3c6a0ba1a7f7a0b.pdf?index=trueIn PDF document text
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_0595f0034d3d4d9899e006f3964b5ef2.pdf?index=trueIn PDF document text
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_24082165da5548b79ffd028fd2de3576.pdf?index=trueIn PDF document text
    • https://ddc7b23b-31e5-4b5c-aaad-d3b7cef26861.filesusr.com/ugd/e506b8_98c1843e4e0c4e6c934a6813eff120cf.pdf?index=trueIn PDF document text
    • http://wekidezeze.epizy.com/nilagapumigemepofufiwezi.pdfIn PDF document text
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_d7adba7d88ef4727aa8e565d25cad87f.pdf?index=trueIn PDF document text
    • https://76a725e8-946c-4ae9-9249-cda469d35108.filesusr.com/ugd/83c8cc_f45fc63399984a91b33a2239a5539b74.pdf?index=trueIn PDF document text
    • http://vodadusilop.rf.gd/jikikuxuvizugogelagex.pdfIn PDF document text
    • http://sopikakerozobud.epizy.com/tolazimuva.pdfIn PDF document text
    • http://zimeketoxera.epizy.com/xugofolos.pdfIn PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_1b85534e78d24650a0767e3a08c7e63c.pdf?index=trueIn 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_off0000e172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE172 5520 bytes
SHA-256: 7ab11ecabb4987238923e1d188e2efb8d33a2a536af57b992d95b6326523e45c
font_01_sfnt_off0000f479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF479 10960 bytes
SHA-256: 602059c4cb3bb3a12882659ab7d98b605ee5d3d8889a6d89aaed98a7b22d27d1