Malicious PDF — malware analysis report

Static analysis result for SHA-256 b94284890e1838ee…

MALICIOUS

PDF

79.0 KB Created: 2021-03-14 19:16:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1f4f54d77dd3d0a36c900a81368b21e7 SHA-1: c975d290dd2d361ae279b82f9ab53bdd3d414775 SHA-256: b94284890e1838ee95f0535b73b62cc51661c53d6f2a7a8bd04adb7d9d5f0d2e
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/123?utm_term=android+tv+raspberry+pi+3 PDF link annotation
    • https://cdn.sqhk.co/botonerepap/Pidhf92/six_guns_gang_showdown_mod_unlimited_money.pdfIn PDF document text
    • https://kivubuzer.weebly.com/uploads/1/3/5/3/135332577/lemixut-vewimo-nufoladuwogi.pdfIn PDF document text
    • https://cdn.sqhk.co/wikaraxixi/ao5QtGj/7024537816.pdfIn PDF document text
    • https://cdn.sqhk.co/nolugavetiri/WhhwJig/somidemotawipepiboxuxegi.pdfIn PDF document text
    • https://cdn.sqhk.co/sagitusat/ihBgcii/royal_robots_battleground_mod_apk_android_1.pdfIn PDF document text
    • https://jedopebo.weebly.com/uploads/1/3/4/8/134889916/1ee9c6ac07c7e.pdfIn PDF document text
    • https://durirumis.weebly.com/uploads/1/3/3/9/133999752/4306681.pdfIn PDF document text
    • https://cdn.sqhk.co/kokojisip/f0WidyI/wodelolukeguwusekefo.pdfIn PDF document text
    • https://tomovomat.weebly.com/uploads/1/3/4/6/134617768/dc6b966d58faf.pdfIn PDF document text
    • https://jagojepenita.weebly.com/uploads/1/3/0/7/130739472/nubaronetiwejofareme.pdfIn PDF document text
    • https://vesabigixovo.weebly.com/uploads/1/3/1/8/131857304/4628880.pdfIn PDF document text
    • https://zomerasojukoluw.weebly.com/uploads/1/3/4/7/134769652/8d1f0c73822.pdfIn PDF document text
    • https://rexaririwe.weebly.com/uploads/1/3/1/6/131637114/2520189.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7e70056c-c2aa-4e53-98c5-50750123c107.filesusr.com/ugd/f8ae5d_db54dafd5e8d41829c37f62c091c4d52.pdf?index=trueIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_23e78234ca114fb290896690095da292.pdf?index=trueIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_39f3ed13fc264a8d93868ee8d52f4a16.pdf?index=trueIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_65d5c99ee99f416798a213bbc26c8949.pdf?index=trueIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_3ec682343a124b5e8b5a27e11218b666.pdf?index=trueIn PDF document text
    • https://6e3eaeb2-b9dd-4462-8b56-96c59beebd9a.filesusr.com/ugd/dcc11b_4748ef1df776495283263919449e4031.pdf?index=trueIn PDF document text
    • https://1747caf2-50c5-4ace-8f30-8d3f4e2f7d49.filesusr.com/ugd/017962_fd0c9e09cc1843cd9c5d051035ca2c10.pdf?index=trueIn PDF document text
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_03d43f9ecc124ff68bb30d40809c986b.pdf?index=trueIn 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_off0000f63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63F 5376 bytes
SHA-256: bb94fe1222dbb2049f0e35e8f8854e54c1ed71b1885c1aa44335bc3c71289c90
font_01_sfnt_off0001089f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089F 11320 bytes
SHA-256: 55cc30476c02a2fafb4a52e7194de76103d243c10ace5da74cba71721aa55f66