Malicious PDF — malware analysis report

Static analysis result for SHA-256 4516cbeb08fa9d4e…

MALICIOUS

PDF

69.6 KB Created: 2021-02-20 00:46:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: aca79dfd9a02b10e1690a236173d9f70 SHA-1: b196417272c9bb04b0b4f1fd0a78c8fa83d0b388 SHA-256: 4516cbeb08fa9d4e51656da2484386d256c68da9da6687148f488f4ab2c56a5e
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable hosting and redirector infrastructure, indicating a link farm or phishing attempt. The 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic firing confirms that at least one URL leads to known malicious redirector infrastructure. The embedded URLs and the 'ML_NYX_PDF_MALICIOUS' score strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=watch+the+hunger+games+mockingjay+part+1+online+free In PDF document text
    • https://pusigigapuguv.weebly.com/uploads/1/3/1/4/131438477/1cd4dc6c944c0.pdfIn PDF document text
    • https://cdn.sqhk.co/gujuvizaja/icdjjRp/apeman_cube_dash_cam_c420_manual.pdfIn PDF document text
    • http://english-10.site/nepej61lno.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/ihcQtif/lupazogasijawaditu.pdfIn PDF document text
    • https://cdn.sqhk.co/butaliwe/cgiiaic/sniper_movie_2017_download.pdfIn PDF document text
    • https://dinuboxisoxim.weebly.com/uploads/1/3/1/8/131857966/fosaxivujuvefag_retapavituwemi_futovukudaj.pdfIn PDF document text
    • https://cdn.sqhk.co/dunafafaxen/Oji3jju/ruzatuzuzebu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450889/normal_601afee5e7f03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501486/normal_5fdee69077559.pdfIn PDF document text
    • https://wobofosowipifir.weebly.com/uploads/1/3/0/7/130776138/zavulozawebakix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424024/normal_5fcd3cce9df58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498994/normal_60120eb868816.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470540/normal_602bb1f9b2050.pdfIn PDF document text
    • https://fumaletaseker.weebly.com/uploads/1/3/1/3/131381433/dosilomojesomag-pipajupol-vurafaza.pdfIn PDF document text
    • https://cdn.sqhk.co/bifoligi/1jbggie/doodle_dj_keyboard.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AF 5736 bytes
SHA-256: 7c484ce8df5d3b340826c6e44b18fd1a5219a126d6e5de677532ed26ab4a71dd
font_01_sfnt_off0000e52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52E 10068 bytes
SHA-256: 336379707fae71bdb551e7c0469d930485c83395a5d940b4c1358c19760f9809

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