Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d3fac3108c8f7f…

MALICIOUS

PDF

67.4 KB Created: 2021-03-26 07:08:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 4fe7c0d7ee14dd9c87bd5e5e11cb6960 SHA-1: 64461c7a7c8332bca84c4996ca1500c85ff27a22 SHA-256: 91d3fac3108c8f7f2ef4513e72fc408d76e8cf10753acca30d1192549a3cb0fc
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URIs, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dugedepap.ru/123?utm_term=gulzaar+chhaniwala+photos++hd PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382962/normal_60027c418e64b.pdfIn PDF document text
    • http://viwimewi.22web.org/zebovufijomomuzunimi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387703/normal_5fe239e544610.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489844/normal_602964c8691fa.pdfIn PDF document text
    • https://cdn.sqhk.co/xadakede/ULihRhe/21176771808.pdfIn PDF document text
    • https://cdn.sqhk.co/wovenebi/hjchfgj/english_songs_mp3_download_sites_free.pdfIn PDF document text
    • https://cdn.sqhk.co/golizojuw/i6ZigfS/brachioradialis_stretch.pdfIn PDF document text
    • https://cdn.sqhk.co/duxapotor/mY2s3DZ/algebra_1_2._2_exercises_answers.pdfIn PDF document text
    • http://bidizujimon.getenjoyment.net/86572136140.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/ijjfwPS/cat_goes_fishing_2019_chomikuj.pdfIn PDF document text
    • https://cdn.sqhk.co/kifukuvitog/gcghfii/koleni.pdfIn PDF document text
    • http://mitatizizuje.mypressonline.com/rofujizebugamaginamogiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482849/normal_605910940339c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://segigeserife.epizy.com/93935787439.pdfIn PDF document text
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_04e13edafe4a4baebbf676e447e54188.pdf?index=trueIn PDF document text
    • http://favilimaj.rf.gd/27027117545.pdfIn PDF document text
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_152c6a025d9c487f929d697f8861a36e.pdf?index=trueIn PDF document text
    • http://rekujub.rf.gd/jacopone_da_todi_donne_de_paradiso.pdfIn PDF document text
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_17b384e99b5d4ad9b5c1155eb40c144a.pdf?index=trueIn PDF document text
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_937d7cc8fa4d4ea797b38649ae2cdff2.pdf?index=trueIn PDF document text
    • http://gedamodeges.epizy.com/blanche_bailly_ndolo_audio.pdfIn PDF document text
    • http://dufojamimusim.atwebpages.com/stock_market_closed_good_friday_2020.pdfIn PDF document text
    • http://gemovimuwopete.atwebpages.com/metal_gear_solid_5_quiet_model.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_off0000ca25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA25 5336 bytes
SHA-256: 3a6af5a7949a01a5045efe9b9496e95ece125ac524bbd9f6d22460c20958fe40
font_01_sfnt_off0000dc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5E 10444 bytes
SHA-256: 5547137c8e9b28dd8d92e996d12ef2d53896a118b767c5b128f7323babe7f615

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