Malicious PDF — malware analysis report

Static analysis result for SHA-256 553d4d118068f8a8…

MALICIOUS

PDF

75.3 KB Created: 2021-02-18 10:20:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0091b321e88d5b10700b467d1ff2656a SHA-1: a0eaef1614ee663d406420a829b358bb6ec6ad4c SHA-256: 553d4d118068f8a892516f19880ab0c475de17c1459be216078efeb02057bc4e
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence ML classifier flagging it as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is part of a link farm, likely for SEO manipulation or to distribute further malicious content. The primary IOC is the external URI pointing to a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://bologen.ru/wix?keyword=4shar%25C3%25A9d+apk+download+for+windows PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426409/normal_5fd16e32abb1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496577/normal_5fe1d0b58dc37.pdfIn PDF document text
    • https://cdn.sqhk.co/janezewufaj/gfaieiu/jegadajufapalodibofiset.pdfIn PDF document text
    • http://kuzamejeluwezik.22web.org/consultation_report_template.pdfIn PDF document text
    • http://smilex.club/75903749592qywgd.pdfIn PDF document text
    • https://beburasitowetu.weebly.com/uploads/1/3/0/9/130969608/95afe2f7563f8.pdfIn PDF document text
    • https://rujupiben.weebly.com/uploads/1/3/4/8/134852491/173998.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463263/normal_5fce9378b8cb1.pdfIn PDF document text
    • http://cleaner360.shop/centipede_game_free563zr.pdfIn PDF document text
    • https://rojuligu.weebly.com/uploads/1/3/0/9/130969709/letuvimodir_zipur.pdfIn PDF document text
    • http://podeves.xyz/xomonekelazopabikuclzl9.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/eibGSQf/92272382977.pdfIn PDF document text
    • http://dorightpress.com/68841046426bbold.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/76944282902.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/gusano_alfilerillo.pdfIn PDF document text
    • http://mezigozogug.rf.gd/asmaul_husna_merdu_penenang_hati.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/88574659076.pdfIn PDF document text
    • http://jugefewaxuxuf.epizy.com/jitufosefe.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/54505496662.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_off0000e949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE949 5420 bytes
SHA-256: 4aa874ce4546d339eb14cfe907196059c6fa43698c4fb47d2f0eaed6171c59d6
font_01_sfnt_off0000fb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB83 10128 bytes
SHA-256: 12fcadc8cb8531df2a8c0a0ceea10e3e337b690635f475445c9309047a0e1b10

Open this report in the interactive analyzer, or submit your own file for analysis.