Malicious PDF — malware analysis report

Static analysis result for SHA-256 668186d6eb2ffbf5…

MALICIOUS

PDF

79.5 KB Created: 2021-03-29 18:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8d67113898bea2f820c46b8c72dc9ec8 SHA-1: 6fc7c8c734d4bc3759f8ada370c301861b70e53a SHA-256: 668186d6eb2ffbf502a2097eb91762834c70d96b42b7b06cc51e6d97cb69c4f8
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 heuristics reveal it functions as a link farm, containing numerous external URLs, many of which are hosted on disposable domains or use UTM parameters, suggesting a phishing or SEO manipulation scheme. The embedded URLs are likely part of this lure, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/strik?utm_term=monitor+card%25C3%25ADaco+speedo+58010g0evnp1+%25C3%25A9+bom PDF link annotation
    • https://razavojukuraw.weebly.com/uploads/1/3/6/0/136090857/bc9eb8.pdfIn PDF document text
    • https://foxazejepanobo.weebly.com/uploads/1/3/1/6/131637169/vefup-suninamomatedi.pdfIn PDF document text
    • http://lupelisizi.medianewsonline.com/lurazawasu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390051/normal_5ff65cda1b7f5.pdfIn PDF document text
    • https://baboxubawuxi.weebly.com/uploads/1/3/4/6/134666135/26c265c922f88.pdfIn PDF document text
    • http://aov.one/tiviralarrdj9g.pdfIn PDF document text
    • https://ratopavitakam.weebly.com/uploads/1/3/4/4/134460251/4831152.pdfIn PDF document text
    • https://riwurarelix.weebly.com/uploads/1/3/4/4/134484082/bewurutilega.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460043/normal_60093dea81b52.pdfIn PDF document text
    • https://jevamupoledi.weebly.com/uploads/1/3/4/7/134712268/kapivobi-luzapojo-sixiwiduf.pdfIn PDF document text
    • https://vadezuposijeru.weebly.com/uploads/1/3/4/6/134660157/zefetidajamur.pdfIn PDF document text
    • http://istlan.fun/how_to_file_a_motion_to_set_aside_a_default_judgementv5u38.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_780e825e0ac240469d3abb9ad16fc1da.pdf?index=trueIn PDF document text
    • http://pikubub.onlinewebshop.net/what_is_tcp_with_example.pdfIn PDF document text
    • https://ca483b97-61ac-4196-bca0-6b249c18eca9.filesusr.com/ugd/b27199_4510c64d8d0e4912b9ff94269d7b14d7.pdf?index=trueIn PDF document text
    • http://putunoxixowelo.atwebpages.com/jozujitovi.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_off0000e231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE231 6064 bytes
SHA-256: 4c0a743450cce3931a3cd34a65a19f17aa58e090c8f12db9d43be31887c0242f
font_01_sfnt_off0000f67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67B 13960 bytes
SHA-256: cf2f423b217bce19884b6c19a5060d6961bf4b2f0a584d059479bcfb6887495f
font_02_sfnt_off0001209f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209F 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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