Malicious PDF — malware analysis report

Static analysis result for SHA-256 873adb52c5f9bfc5…

MALICIOUS

PDF

77.7 KB Created: 2021-05-29 21:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 68e08565f2589119e76f9503949b3038 SHA-1: dde37b6464a2349e31a73a4283d5656208417201 SHA-256: 873adb52c5f9bfc56effd0dbe6a12f7de4b9d5bb0a2bc72b7c5dc6eb6873fe8a
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm with numerous external URLs, including one pointing to zajinet.ru, suggesting it's designed to redirect users to potentially harmful sites. The PDF structure and embedded links are consistent with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=las+cronicas+de+narnia+3+pelicula+completa+en+espa%25C3%25B1ol+repelis PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485152/normal_5ff532255331e.pdfIn PDF document text
    • https://bifutizuwosedi.weebly.com/uploads/1/3/4/6/134645412/827e0317116.pdfIn PDF document text
    • https://xukutejupu.weebly.com/uploads/1/3/4/4/134487517/ba8408ab6b3.pdfIn PDF document text
    • https://jukakolirofo.weebly.com/uploads/1/3/1/4/131408741/muziruve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377704/normal_6044d833ec8b3.pdfIn PDF document text
    • https://judetali.weebly.com/uploads/1/3/4/7/134723341/pojokibaj-rizad-jatib.pdfIn PDF document text
    • https://nelubetif.weebly.com/uploads/1/3/5/3/135322580/wadafuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383918/normal_606b984f1ddb4.pdfIn PDF document text
    • https://keziraxese.weebly.com/uploads/1/3/4/5/134576249/6027064.pdfIn PDF document text
    • https://vawevoza.weebly.com/uploads/1/3/1/4/131482963/suredivokija-kosonurege-lotarapazik-jimefotugakik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470207/normal_604463ad8ea37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497346/normal_605f878abce76.pdfIn PDF document text
    • https://pufujodixig.weebly.com/uploads/1/3/1/4/131438007/63230.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450625/normal_5ff2be911d24a.pdfIn PDF document text
    • https://tijezelaxupoki.weebly.com/uploads/1/3/5/3/135340387/fa8ca1012.pdfIn PDF document text
    • https://jexiwelim.weebly.com/uploads/1/3/4/7/134717468/wiselifegavoven.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3091ca9c-0230-4745-8548-b6f470ecab1e/1808562506.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78b2cc89-d6e2-4f1a-a7ff-7dfb2b93365a/how_to_write_a_script_for_a_video_presentation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93ca3618-68e2-433c-9ffe-ad5692e8ca60/linksys_ac1200_usb_adapter_range.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc8b77d6-e6ef-4d66-b861-7a491c30a4f1/lugotoj.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA1 5536 bytes
SHA-256: 041b029caf33db6db90082b171a63fd69e46e4e2397c20660dfe16958456d0b9
font_01_sfnt_off0000ed13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED13 6736 bytes
SHA-256: cb449ab390cbc9c8c1560aede703b153dd24ae3be30c9b40d0b86447b1afed09
font_02_sfnt_off00010030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10030 11392 bytes
SHA-256: 80b21c8e134efe06f6ded80fbcd13b169fedd4024b61b22c556116b997c55d0a