Malicious PDF — malware analysis report

Static analysis result for SHA-256 adec51906952660c…

MALICIOUS

PDF

75.1 KB Created: 2021-02-17 09:46:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 66e24e7c34d6aba3ca89c7ccc10cf2c6 SHA-1: d277eb4bab47f22b444b7d54bba13610ecd44672 SHA-256: adec51906952660c73bec8e87e404588c0c7f4f05b22daf388856221c4a7e5a0
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/strik?utm_term=glass+bead+game+book PDF link annotation
    • https://pubogovivewata.weebly.com/uploads/1/3/2/3/132302724/edcdb9b05d09d.pdfIn PDF document text
    • https://domilejoxu.weebly.com/uploads/1/3/4/5/134529458/favilubit_logogedo_zegobufaxi.pdfIn PDF document text
    • http://tezatigobupuvu.22web.org/71501460523.pdfIn PDF document text
    • https://litolojinoforiw.weebly.com/uploads/1/3/4/7/134721995/9123.pdfIn PDF document text
    • https://nolizusumebixaz.weebly.com/uploads/1/3/1/4/131438071/118bbda.pdfIn PDF document text
    • https://gixebodaloru.weebly.com/uploads/1/3/1/3/131379223/nujepi.pdfIn PDF document text
    • https://rorezumi.weebly.com/uploads/1/3/4/5/134591247/welunerigut.pdfIn PDF document text
    • https://vifelewumatorav.weebly.com/uploads/1/3/4/6/134669873/8007438.pdfIn PDF document text
    • https://nitegira.weebly.com/uploads/1/3/1/0/131071289/garomijepolowusa.pdfIn PDF document text
    • http://xufubub.iblogger.org/1015470649.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rigeladujonij.epizy.com/bostan_saadi.pdfIn PDF document text
    • http://zegemipufe.epizy.com/90832438531.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79E 5284 bytes
SHA-256: defeac7d2da62774dfd2623c6f06ecf3a1e64500b2942114cee0689cfab8358d
font_01_sfnt_off0000f98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98A 11264 bytes
SHA-256: 79a617958817a6685536c56568007a81cb15003fbec8c480ea6cf71443b00e95

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