Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a3ff6799b5b35b…

MALICIOUS

PDF

100.7 KB Created: 2021-04-30 10:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f1d3b583c87f97774b960989e6e90a85 SHA-1: 2ff7b5d6af32652c15721f8ac9415be42b7c6a86 SHA-256: b5a3ff6799b5b35b5aa0170786de69d36dc2fe258967af0b882b42c256fe9894
134 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lozipotod.ru/strik?utm_term=practical+functional+behavioral+assessment+training+manual PDF link annotation
    • http://duplicwcnj.space/tekide4y772.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://fortuneo.biz/13307734122qiaxe.pdfIn PDF document text
    • http://cancandance.org/six_sigma_questions_and_answersiu4kw.pdfIn PDF document text
    • http://wuvijenebomukib.iblogger.org/25148782657.pdfIn PDF document text
    • http://xomaweluk.22web.org/where_can_i_buy_a_song_of_ice_and_fire_wiki.pdfIn PDF document text
    • http://ekzo-fruit.ru/xewogupokojawezame5zqts.pdfIn PDF document text
    • http://getallcreditscores.info/how_to_do_fundamental_and_technical_analysis_of_stockslubxh.pdfIn PDF document text
    • http://parkingtest.xyz/54819478551y11j1.pdfIn PDF document text
    • http://natfreshik.fun/26309479195xbeiq.pdfIn PDF document text
    • http://nikecortez.net/wijudewevvgk45.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/vebogotexaf/75769849026.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/simple_drum_music_for_beginners.pdfIn PDF document text
    • http://zamutodud.rf.gd/akon_beautiful_song_free.pdfIn PDF document text
    • http://fanulatanaz.rf.gd/workout_and_diet_plan.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_off0001491e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1491E 5496 bytes
SHA-256: a27e5e9efe306bd0fc5fa49d9e7eee7abe69d48c18f5bf5610c2920bac4a7b11
font_01_sfnt_off00015bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BAE 11628 bytes
SHA-256: 4f123c5f8d4f88a34d9972baed83eabfcd4a1d79eb33c47c22011e1ec92f1088

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