Malicious PDF — malware analysis report

Static analysis result for SHA-256 150f2c4dede30447…

MALICIOUS

PDF

79.6 KB Created: 2021-03-03 23:36:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 555f6890ca916419e0fa3a7ee56c2406 SHA-1: 8f215ae5a9ae4df670dbee3aea221877c457a12d SHA-256: 150f2c4dede3044711f54b62dfbcf0dbf5c703d374c554779dc9c15b0222cfb9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://seumenha.ru/aws?utm_term=a+tres+metros+del+cielo+serie+netflix+reparto PDF link annotation
    • http://cosmostil.top/hasi_ban_gaye_lyrics_songjz58m.pdfIn PDF document text
    • http://negozio50sconto.info/544129897141aakf.pdfIn PDF document text
    • http://clyb-wylcan3.space/xejumaloa8xls.pdfIn PDF document text
    • https://tebozelekunoton.weebly.com/uploads/1/3/1/4/131453588/5e7e4e21e1e8.pdfIn PDF document text
    • https://cdn.sqhk.co/dizoketa/gd09gdY/naroth_hack_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/g2jjifa/guwofidi.pdfIn PDF document text
    • http://idealicacolumbia.site/625764852521od9g.pdfIn PDF document text
    • https://cdn.sqhk.co/ladesajisama/ga6icia/wood_carving_knife_near_me.pdfIn PDF document text
    • http://promoocaoameericanas.com/i_am_who_you_say_i_am_sermongzfkl.pdfIn PDF document text
    • https://buzoraxuv.weebly.com/uploads/1/3/4/3/134366179/savuku.pdfIn PDF document text
    • https://jubibesu.weebly.com/uploads/1/3/1/3/131379113/6190255.pdfIn PDF document text
    • https://pinukozemaf.weebly.com/uploads/1/3/4/7/134713375/ee5b87a.pdfIn PDF document text
    • https://lupofavegevo.weebly.com/uploads/1/3/5/3/135335207/5869359.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/tidigudetefumof/40631158791.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/zapefesozoxubo.pdfIn PDF document text
    • http://pozirumine.epizy.com/dakonekeferesovomilavogon.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/evanescent_wave_waveguide.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_off0000f65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65B 5360 bytes
SHA-256: 815155fd1ef971afc322296d7ad821350ffa7ddd0dd7ff3b4d4d18e6c4d77b71
font_01_sfnt_off00010882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10882 11960 bytes
SHA-256: dc07f4a38e295c82d145ba40edcbe299b5c33a1e6e28050d448006d3360f3b0d

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