Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ea540fc14cca1c1…

MALICIOUS

PDF

80.7 KB Created: 2021-05-22 19:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 042aa95cdf3206bfdbcd409b778dd531 SHA-1: 8af5da403949f5e8908c7b5af25077e866d685e9 SHA-256: 2ea540fc14cca1c137fddbf4a6ceb38f3bdf12e3e106ea41bf2bc1d21277e1b8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of these links, 'https://botokaw.ru/strik?utm_term=how+to+lower+chat+volume+on+ps4', is flagged as an external URI. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or redirecting users to malicious sites. No scripts were extracted, but the structure suggests an attempt to manipulate search engine results or lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=how+to+lower+chat+volume+on+ps4
    • https://cdn-cms.f-static.net/uploads/4489988/normal_605317a42be40.pdf
    • https://cdn-cms.f-static.net/uploads/4411219/normal_606b60e328762.pdf
    • https://resagivet.weebly.com/uploads/1/3/1/3/131383325/6525446.pdf
    • https://wugusuza.weebly.com/uploads/1/3/4/1/134131733/bb3ebd3a0e384.pdf
    • https://static.s123-cdn-static.com/uploads/4375206/normal_5ffdb622e4018.pdf
    • https://milorali.weebly.com/uploads/1/3/5/9/135965765/sulegiza-zeneganukosi-tuloxoli-vusapenonujoja.pdf
    • https://static.s123-cdn-static.com/uploads/4404123/normal_5fcdcf4a14a46.pdf
    • https://fobezirovopar.weebly.com/uploads/1/3/4/6/134681670/8560453.pdf
    • https://jematujevuzonip.weebly.com/uploads/1/3/4/2/134235480/2833fce670b0.pdf
    • https://lelusujizuzu.weebly.com/uploads/1/3/1/4/131438438/3972659.pdf
    • https://nevutero.weebly.com/uploads/1/3/4/7/134716167/4355597.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/800e69b3-5a7e-4aee-9831-111dd1ce9be3/73543821204.pdf
    • https://uploads.strikinglycdn.com/files/d1db6bfa-deaa-4ca4-b28b-81fb697caf32/46518793844.pdf
    • https://uploads.strikinglycdn.com/files/75c714bd-4684-4e01-badf-e7a35e07297a/walmart_65_inch_roku_tv_black_friday.pdf
    • https://uploads.strikinglycdn.com/files/1ef31d0f-4cca-4019-b0de-e513eebbdd1c/pevabezoremajenuwil.pdf
    • https://uploads.strikinglycdn.com/files/fcfa66c5-d5ff-4ed3-8f82-de98519eda1e/94539673728.pdf
    • https://uploads.strikinglycdn.com/files/a819533b-07e5-4311-a080-536ad27e26a3/tujelopekujedu.pdf
    • https://uploads.strikinglycdn.com/files/79f18f30-449e-44c1-a1ba-7407bb32cb09/lugagijifuripi.pdf
    • https://uploads.strikinglycdn.com/files/fa466c6d-8276-4840-8602-e2040f7adec0/codex_atlanticus_leonardo_da_vinci.pdf
    • https://uploads.strikinglycdn.com/files/7736992a-e0b5-485d-8930-87fa8763595d/bible_verses_relating_to_police_brutality.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_off0000fadb.bin
37434666394b7e5b0785db760352354aaf2e130cc63a257f987444c2b7a51872
pdf-font-stream PDF embedded font (sfnt) at offset 0xFADB 5372 bytes
font_01_sfnt_off00010d10.bin
15c78bef3a326f0d81656c6bd4f44c39ff85c0f03c7296b31d6d0f06d5699529
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D10 11444 bytes