Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c6770c6c9ed70a…

MALICIOUS

PDF

78.1 KB Created: 2021-03-22 02:07:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 20334fa61ef691600831a09f0fda23f6 SHA-1: 39fc9d3b23452932b194b624460e10ba540f4269 SHA-256: 25c6770c6c9ed70a1ea207d22a04a41267c98c5f31ebae29502e0b4e3abce13a
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or scamming. The embedded URL and the document body's deceptive content about fixing Amazon Fire tablet batteries support this conclusion.

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://kuzutuzo.ru/strik?utm_term=how+to+fix+amazon+fire+tablet+battery PDF link annotation
    • https://tujilebofali.weebly.com/uploads/1/3/5/3/135398949/rapopemapakel.pdfIn PDF document text
    • http://securityverifiedservices.com/the_ugly_american_audiobooko6st4.pdfIn PDF document text
    • http://dihtyar.online/61128246823gtfk3.pdfIn PDF document text
    • https://dewajijivixire.weebly.com/uploads/1/3/4/6/134638152/0e73cbe39db3a.pdfIn PDF document text
    • http://hellesypakk.online/roland_td30_module_for_sale7ayon.pdfIn PDF document text
    • https://tufelonidozuwux.weebly.com/uploads/1/3/2/6/132681512/aa1ee93fdcf0d5.pdfIn PDF document text
    • http://moneymaya.site/7908472073692qam.pdfIn PDF document text
    • http://parhelifrl.space/lenovo_thinkpad_t430_memory_replacement5hpp2.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/ella_minnow_pea_chapter_1_summary.pdfIn PDF document text
    • https://sefatepasegul.weebly.com/uploads/1/3/0/7/130775173/ddd852541dbe7e2.pdfIn PDF document text
    • http://limuzinof.ru/19492273689bee8a.pdfIn PDF document text
    • https://valetakomo.weebly.com/uploads/1/3/4/0/134012509/8312877.pdfIn PDF document text
    • http://probmaka.tech/free_radius_diameter_and_circumference_worksheetsapi0o.pdfIn PDF document text
    • http://milanomoda-italy.website/benoit_mandelbrotkpm81.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://20097937-9b7a-4da4-851c-33e9a8906939.filesusr.com/ugd/1e3518_53984683dbed48898d579e81283c0306.pdf?index=trueIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_7544c954a5e0469e9d6f8e53510e0964.pdf?index=trueIn PDF document text
    • https://1527c8d3-3321-4e9f-872f-e2bebb57bac2.filesusr.com/ugd/bf2d42_ed64d03a9adf428b8c3d11b698d7853b.pdf?index=trueIn PDF document text
    • https://9e2901ea-5d25-41a5-867c-54d0774c6e48.filesusr.com/ugd/4d0f37_4e5405c5e1ea4dcaa815d48ac5e48ec2.pdf?index=trueIn PDF document text
    • http://satawakerexe.atwebpages.com/94815742075.pdfIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_8f32f50c7525436896de76d77843342c.pdf?index=trueIn PDF document text
    • https://334e481f-4595-4613-8514-cf1b68b0f675.filesusr.com/ugd/a5bb32_bff8ee42cc7b48d3a4c0220ba5d00040.pdf?index=trueIn PDF document text
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_6106246106674f9faf640cf32e7fa210.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_off0000f544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 5148 bytes
SHA-256: a7434b77955ad6dd42e99a5adee357209f74d0d3a566ebc082d57c6e1e5c893a
font_01_sfnt_off000106d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D5 10616 bytes
SHA-256: 70c5a0ba8a7971b5ae9a7eb228c37a098a994aa8b712e8c54fcfe5320b7d9423