Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff0152b19b15867…

MALICIOUS

PDF

111.2 KB Created: 2021-03-10 10:21:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d6d949eaf7a5f2d1a5b34fe253a5e487 SHA-1: d4b84e620407af3ca99e6c8ac6886143e45ded02 SHA-256: 4ff0152b19b15867814add82ee2a3ea19f90c5634f6dd072dc67725f57c2a72f
284 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous embedded links, identified as a link farm and a redirector to malicious infrastructure. Several heuristics indicate the PDF is designed to lead users to suspicious domains, with one link specifically pointing to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious, supporting the phishing and redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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/award?keyword=atrocity+act+1989+in+marathi+pdf In PDF document text
    • http://koteyarn.moscow/xeponagenaxademelufemo5e9f5.pdfIn PDF document text
    • https://fexiganariv.weebly.com/uploads/1/3/0/7/130739648/9999356.pdfIn PDF document text
    • https://sotugenedoximo.weebly.com/uploads/1/3/4/0/134040923/disorononaje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388279/normal_600a82faf1378.pdfIn PDF document text
    • http://securityofusersdevicesonline.site/final_fantasy_7_remake_episode_2_ps51twrr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461211/normal_603ab59a869cf.pdfIn PDF document text
    • https://boliminukedakos.weebly.com/uploads/1/3/4/4/134494229/widakopu-bikafug-jixopesozapi-naweze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385197/normal_60141906e2b5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459621/normal_600dcfbd59b3d.pdfIn PDF document text
    • http://meriline.store/american_pie_putlockers129o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_a523a1a262ac4243b8515f30cd9ac518.pdf?index=trueIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_48668187bdce4a5fad22487b71911bf6.pdf?index=trueIn PDF document text
    • https://f867c6cd-7aae-4938-a634-6821dcb48262.filesusr.com/ugd/eb45fa_8ac7cc1a2b9d493fac3cf1363d248099.pdf?index=trueIn PDF document text
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_c9d449a964124905b99a646d945a49ee.pdf?index=trueIn PDF document text
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_d7789a4e13e14e7095a77e3e35d8c582.pdf?index=trueIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_d651ecceef8d4b23bcca03d2da3d11c7.pdf?index=trueIn PDF document text
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_8ad2897365974024bda73d954f0492b2.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_off000178cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178CF 5680 bytes
SHA-256: 886fc80bed753b8353081b11c72a0dd867e878059c163fd1bef8dbfd93481dfb
font_01_sfnt_off00018c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C09 10348 bytes
SHA-256: 376e553cffb183c71bdc6bcb77a1c56f8d7a8695bef171481b9f73ab3306552e