Malicious PDF — malware analysis report

Static analysis result for SHA-256 759b6b9c675526fd…

MALICIOUS

PDF

74.6 KB Created: 2021-03-22 04:28:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37c419632bfc1cd2a1d4724c54af1e0e SHA-1: b06a0b68ec53d4f85b2bffacdf8a1e45a3f9c789 SHA-256: 759b6b9c675526fdecf6ed0830edc86edc08edab7605eae428ef4e227a1280d9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which are disguised as downloadable PDF files, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The presence of embedded URLs and the heuristic PDF_SEO_LINK_FARM firing suggest the document is designed to redirect users to malicious sites, likely for exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/strik?utm_term=beehive+english+book+class+9+solutions+pdf
    • http://fakts.design/dhoom_machale_bike_race_song_downloadbihtf.pdf
    • https://kagilovudugavap.weebly.com/uploads/1/3/1/1/131164538/fivare.pdf
    • http://vomamafawib.scienceontheweb.net/93126142994.pdf
    • https://fujovufizopi.weebly.com/uploads/1/3/2/7/132710671/zuxodorujabu.pdf
    • https://nasebawesor.weebly.com/uploads/1/3/1/6/131637432/3007342.pdf
    • http://nebofonuve.mywebcommunity.org/51682803380.pdf
    • http://boxijogirexu.medianewsonline.com/badede.pdf
    • http://sizuxofutitarax.mypressonline.com/wagiborokotibofatax.pdf
    • http://dukawipo.22web.org/lego_boost_user_manual.pdf
    • https://dafepigog.weebly.com/uploads/1/3/4/6/134605944/04c0b991aaa99c.pdf
    • http://meblik.su/fituxugogolotax7zncb.pdf
    • https://jajibesuwazigix.weebly.com/uploads/1/3/1/3/131383486/b7829a78.pdf
    • http://ziposodepow.mywebcommunity.org/attahiyat_surah_in_tamil.pdf
    • https://gawofatofuwe.weebly.com/uploads/1/3/1/3/131380275/604315.pdf
    • https://fegojobakib.weebly.com/uploads/1/3/1/1/131163858/beregapubuzerenevesi.pdf
    • https://gazuxupoje.weebly.com/uploads/1/3/4/1/134108966/deromowosisipadokesu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zokezokofanimep.epizy.com/tipos_de_empresas_segun_su_forma_juridica.pdf
    • https://uploads.strikinglycdn.com/files/54fdcefe-955f-424c-a27f-4d308551ea4f/98274463650.pdf
    • https://uploads.strikinglycdn.com/files/9db2d031-09a0-432a-9e0d-650d68e9fb2c/42173266808.pdf
    • http://nitetuxal.epizy.com/70721038670.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e58b.bin
2ecea51d6a4ad8cc3020e51cdd747cb6372cd2e0b0ebd249256f5ebbf8042d56
pdf-font-stream PDF embedded font (sfnt) at offset 0xE58B 5788 bytes
font_01_sfnt_off0000f953.bin
b6daa635f42e959d54138c81b3d846fcf86c4699949e4df0fe68a197a48166d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF953 10496 bytes