Malicious PDF — malware analysis report

Static analysis result for SHA-256 820a5a19eb46857b…

MALICIOUS

PDF

83.4 KB Created: 2021-03-25 13:09:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d22e73d2c0242d437df34941e41894f0 SHA-1: 6b35686d9761bfafe5a50ecaa71f866de0f1e51d SHA-256: 820a5a19eb46857b1715a3d0f908ae6846a43e18aa9c62fbb78ad757d3572b02
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content or phishing sites. The presence of embedded URLs and the overall structure point towards a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=even+piell+clone+wars PDF link annotation
    • https://pajapuzewufivu.weebly.com/uploads/1/3/5/3/135305216/fuvukejarukid-vopajuzekales.pdfIn PDF document text
    • https://gakosokilexavum.weebly.com/uploads/1/3/2/6/132695298/fdeb5dd5aaee5.pdfIn PDF document text
    • https://nulumekut.weebly.com/uploads/1/3/4/3/134373747/sapozofenodupi_vusasiv_sakidenuvijoka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487663/normal_5fc79cab65861.pdfIn PDF document text
    • https://rogetaguw.weebly.com/uploads/1/3/1/4/131407632/tenalarufujufivub.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/B8igcnz/73729632735.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370317/normal_5ffa7cfc7042a.pdfIn PDF document text
    • https://cdn.sqhk.co/nerutadege/EjhjQif/ponosixunetufodetufuxu.pdfIn PDF document text
    • https://cdn.sqhk.co/xexogataza/4r2igij/24597918291.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478667/normal_604eeb9eb04ba.pdfIn PDF document text
    • https://mapaforidax.weebly.com/uploads/1/3/4/0/134012560/9394821.pdfIn PDF document text
    • https://wesoxiworikezux.weebly.com/uploads/1/3/1/3/131380467/zepovuvuta.pdfIn PDF document text
    • https://tubufuximenijo.weebly.com/uploads/1/3/5/3/135304690/9c10d0cf9d7b.pdfIn PDF document text
    • https://nagaleburanab.weebly.com/uploads/1/3/4/3/134379557/fa1ec69c076.pdfIn PDF document text
    • https://lokurosafo.weebly.com/uploads/1/3/4/4/134479987/manesajatejo-piwonilo.pdfIn PDF document text
    • https://xowonijateroz.weebly.com/uploads/1/3/1/3/131380337/707cbdd3c05c5fa.pdfIn PDF document text
    • https://cdn.sqhk.co/lukedivibeb/FuDgcgg/pogromcy_duchow_film.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mejefelutirarej.epizy.com/audiophile_quality_music_player_for_android.pdfIn PDF document text
    • http://davutawopoban.epizy.com/guide_jax_s9.pdfIn PDF document text
    • http://xojesenokok.epizy.com/83976721157.pdfIn PDF document text
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_471f8bc5f4f24b4ab2f90ef24dcac116.pdf?index=trueIn PDF document text
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_4324f9a3984d4ac5b7918d19b708724d.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_off000109a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A6 5036 bytes
SHA-256: 18c6341e3274b53e061a8251c82bf26388bfa836a578af4429e5c746acc91167
font_01_sfnt_off00011af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF1 11176 bytes
SHA-256: 3fdce1efc2dbf1fcf35fbc803fa9c8463378100a77473c488eff5cc309b059bf