Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffe1c71b45d2778c…

MALICIOUS

PDF

77.0 KB Created: 2021-06-08 23:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4b469953acc008a2df2099e29b5db24b SHA-1: 533d0d8815d0f07a2872e52e666e30bb7f342f5f SHA-256: ffe1c71b45d2778cfb61669eec5f1958f7b5a7a43b053534a8962cd80b769468
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO spamming operation. The document body, though heavily obfuscated, contains text related to 'fluffy slime without glue' and application metadata, indicating a lure. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with a high ML classifier score and ClamAV detection, strongly indicates malicious intent, likely for traffic generation or potentially distributing further malicious content.

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://nomylo.ru/pbw?utm_term=how+to+make+fluffy+slime+without+glue PDF link annotation
    • https://jarofudi.weebly.com/uploads/1/3/1/4/131408364/dudus_xabel_biwawi.pdfIn PDF document text
    • https://lumikefobebodas.weebly.com/uploads/1/3/4/3/134324067/bawiwek.pdfIn PDF document text
    • https://wajajudamivigo.weebly.com/uploads/1/3/4/3/134359543/pumivo.pdfIn PDF document text
    • https://ximesadi.weebly.com/uploads/1/3/0/9/130969353/newadenuxanize.pdfIn PDF document text
    • https://dametubidino.weebly.com/uploads/1/3/1/3/131383661/nirekaxibavajol-bijobadufel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455645/normal_5ff8c692bc535.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404990/normal_600f1f252b900.pdfIn PDF document text
    • https://ligavovifoma.weebly.com/uploads/1/3/4/5/134522072/7402553.pdfIn PDF document text
    • https://wesojejupeledaw.weebly.com/uploads/1/3/4/4/134446418/475207.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416806/normal_601313350208d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://munonoraze.pbworks.com/f/super_mario_galaxy_iso_ita.pdfIn PDF document text
    • http://fosirodovo.pbworks.com/w/file/fetch/144597300/class_8_english_grammar_paper.pdfIn PDF document text
    • http://rijunepupuja.pbworks.com/w/file/fetch/144562620/what_were_the_chumash_houses_made_out_of.pdfIn PDF document text
    • http://nefusim.pbworks.com/f/bojo_mujo_marry_me_free_mp3_download.pdfIn PDF document text
    • http://rukutuxeriro.pbworks.com/f/gelabexolitudajor.pdfIn PDF document text
    • http://demopefo.pbworks.com/w/file/fetch/144528897/best_coc_town_hall_7_war_base.pdfIn PDF document text
    • http://zajozote.pbworks.com/f/vawokiwizukakalezaromitem.pdfIn PDF document text
    • http://garewewaziwu.pbworks.com/w/file/fetch/144551847/powuwaxopujekegot.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_off0000f133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF133 5304 bytes
SHA-256: 56d2c98d3ac77b68f4ebe1c3237dadc105cf72eff6a9367de6e981b64bc874e5
font_01_sfnt_off00010338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10338 10372 bytes
SHA-256: 72230db6017c139df36c10c9a464c8738b65b717c50275d17a1d71e20711eb25

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