Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a30a3665fe84afb…

MALICIOUS

PDF

73.5 KB Created: 2021-06-14 00:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7c6da68e6ce9c82492828ee399ab17c1 SHA-1: 8bed3b8f873ef40e5b557f94b55d6e975f1724e7 SHA-256: 4a30a3665fe84afb1463fa6f56781d1643d19faa81d6e30afc541a063125c7c3
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous external URLs, with a primary URL pointing to a site that appears to be related to exam results. The PDF's structure and embedded links suggest it is designed to redirect users to potentially harmful content or phishing sites.

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://dafemum.ru/123?utm_term=hbse+result+2019+10th+class+date+sheet PDF link annotation
    • https://dabawide.weebly.com/uploads/1/3/7/5/137511183/lomurakizosalixovesa.pdfIn PDF document text
    • https://nejaxadutoxukax.weebly.com/uploads/1/3/4/6/134622523/zegozifosijuzor.pdfIn PDF document text
    • https://rixorololexapi.weebly.com/uploads/1/3/1/8/131857390/migerasi-tegopusokaves-bewilixewo-torebufuvor.pdfIn PDF document text
    • https://miluxeto.weebly.com/uploads/1/3/5/3/135326788/2225763.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472484/normal_60bd745fd52b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386347/normal_5fc5b1d5d219f.pdfIn PDF document text
    • https://pakezumada.weebly.com/uploads/1/3/4/3/134368128/darakew-kunezakap.pdfIn PDF document text
    • https://jobeluraxofedir.weebly.com/uploads/1/3/4/3/134317239/2947161.pdfIn PDF document text
    • https://titevajap.weebly.com/uploads/1/3/2/7/132741099/wowunozojenut.pdfIn PDF document text
    • https://fenitejum.weebly.com/uploads/1/3/2/3/132302819/sevax-nezen.pdfIn PDF document text
    • https://lemevepavakupe.weebly.com/uploads/1/3/4/7/134701524/zevugafib.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/785b42d6-3cc1-4e9a-8deb-721e6497e097/99167984148.pdfIn PDF document text
    • http://vafobotigef.pbworks.com/w/file/fetch/145117008/numbers_and_colors_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1501f0f0-c4a9-4aed-bebf-32431b66a97f/echo_weed_eater_model_srm_2100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/274b180b-bf8d-4ad4-a38c-3485f64cd5b3/is_disney_plus_on_samsung_smart_tv_apps.pdfIn PDF document text
    • http://sozevupegufi.pbworks.com/f/xunumifago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5bad7fa-f3a7-411a-b920-c810a36a604c/balomi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bb3d69a-7076-4cf0-927c-002f3c73e3a7/56070406937.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd91254e-1f26-4f15-b156-f2d677b5f636/kaxiraxulogolo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1A 5612 bytes
SHA-256: 4d2b9a8fcfe2a016cdba6aac6177152fc7fc609c83daf4bcd3a4ebbd36122be3
font_01_sfnt_off0000f21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21C 11332 bytes
SHA-256: cbdae5ab7b1bb43fc5ee8539ae17a549f78e80e025a6b752cd7e1d530a80b1d1