Malicious PDF — malware analysis report

Static analysis result for SHA-256 f88538c51ae1533b…

MALICIOUS

PDF

78.3 KB Created: 2021-03-23 04:33:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 1bbdf30e29476669f80977273a664176 SHA-1: 36075e476205a6bb6af944edbd3ba533d595bc7a SHA-256: f88538c51ae1533bcd008eccd0fd8aa2b82e18e78a37a0442ac54716eb3822c3
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded content, though heavily obfuscated, likely serves to direct users to these malicious URLs.

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://zajinet.ru/wix?keyword=skam+nl+season+2+episode+10 PDF link annotation
    • https://ponixetuga.weebly.com/uploads/1/3/4/6/134668384/memopijetami.pdfIn PDF document text
    • http://salearea.pro/hunger_games_mockingjay_part_1_plot_summary194sa.pdfIn PDF document text
    • https://pojojupekofep.weebly.com/uploads/1/3/4/7/134754506/xepemazuwupumonogi.pdfIn PDF document text
    • https://zejosawazir.weebly.com/uploads/1/3/1/8/131856185/6612541.pdfIn PDF document text
    • https://sedapelagug.weebly.com/uploads/1/3/4/1/134109100/5431834.pdfIn PDF document text
    • https://duwaxitim.weebly.com/uploads/1/3/4/3/134312722/8395939.pdfIn PDF document text
    • https://besugadofozoxi.weebly.com/uploads/1/3/5/3/135396803/kukabopebovirik_luberagazosa_funuzakojawot.pdfIn PDF document text
    • http://glossywp.online/577430551760y5u9.pdfIn PDF document text
    • https://musevupuli.weebly.com/uploads/1/3/1/4/131438528/dd67e3.pdfIn PDF document text
    • https://nedamekiwuj.weebly.com/uploads/1/3/1/3/131379605/5000144.pdfIn PDF document text
    • https://jibajupo.weebly.com/uploads/1/3/1/6/131636806/4224083.pdfIn PDF document text
    • https://moniraje.weebly.com/uploads/1/3/1/4/131438162/7707790.pdfIn PDF document text
    • https://matomuzunoto.weebly.com/uploads/1/3/5/3/135389802/d48305025.pdfIn PDF document text
    • http://wajawizidixuwam.22web.org/lefituwir.pdfIn PDF document text
    • https://galujamisone.weebly.com/uploads/1/3/1/8/131871568/vapabatevuludegakosa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kimanaw.epizy.com/get_out_of_debt_plan_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/borajibusaledavad.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/excel_vba_search_sheet_for_value.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/fetesatomaselisuvufomon.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_off0000f44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44C 5504 bytes
SHA-256: 54942b804251327e44027bda74a4ea70fff1c18d6924d9f9e88d8819973bfdac
font_01_sfnt_off000106ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FF 11104 bytes
SHA-256: 06401dd7eec5e738184e1582d9cf6015a290ceca7effe60bca5befa89c5faede

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