Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb3566e7e741412…

MALICIOUS

PDF

84.7 KB Created: 2021-03-07 09:40:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8063787f46ae28dfa8186935394501d3 SHA-1: 9d547e4a74b0897fcc1831574ce5bda7c7245d20 SHA-256: dfb3566e7e741412686587ebbde7e1ce247e9903060363efe7fd70fb154ed1d4
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/wb?keyword=face%20portrait%20sketch%20tutorial PDF link annotation
    • http://rubodexeduf.iblogger.org/10356779439.pdfIn PDF document text
    • http://kimagibasip.22web.org/34100806487.pdfIn PDF document text
    • https://cdn.sqhk.co/bawevabob/DYpgegg/12716670646.pdfIn PDF document text
    • http://mitedujonajezed.scienceontheweb.net/wigasivijesineneku.pdfIn PDF document text
    • http://waparudadip.mywebcommunity.org/74094798234.pdfIn PDF document text
    • https://cdn.sqhk.co/temisexezoda/ifYjahd/kim_kardashian_hollywood_baby_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/gagowuname/fXLFvZM/craigslist_ny_cars_by_owner_long_island.pdfIn PDF document text
    • http://tipopajokoti.iblogger.org/miweturulijap.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/gighcji/zefijojejusal.pdfIn PDF document text
    • https://cdn.sqhk.co/lamiwifa/4EjhalG/zombie_age_1_mod_apk_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nusilemil.epizy.com/91900478347.pdfIn PDF document text
    • https://65d0a56f-4074-4e8f-9acc-29e6f8e8f663.filesusr.com/ugd/37655d_d5394464edad4ee8bf65cf3333d4cdcd.pdf?index=trueIn PDF document text
    • http://jawikaginixuxuz.rf.gd/walk_like_a_champion.pdfIn PDF document text
    • http://rubipupajet.rf.gd/mossberg_590a1_m-lok_50769.pdfIn PDF document text
    • http://gabotemoba.epizy.com/ansel_adams_books.pdfIn PDF document text
    • http://vezapuro.rf.gd/incidental_pieces_of_information.pdfIn PDF document text
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_fbcbb401ac38477a9716614e0866a276.pdf?index=trueIn PDF document text
    • http://wokarodefi.onlinewebshop.net/best_racing_games_for_windows_10_pc_free_download.pdfIn PDF document text
    • http://bavabime.rf.gd/viroj.pdfIn PDF document text
    • http://gagonunanu.epizy.com/babemalujetowaf.pdfIn PDF document text
    • http://godubaxedija.rf.gd/bosufageso.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_off0001102f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102F 5040 bytes
SHA-256: ca9a920d7475c734aff92342c2638b13fcaf3d33f19acc10351d3895f0d3979a
font_01_sfnt_off00012152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12152 10532 bytes
SHA-256: 2ba9cbf8937eae0c0d51a6025534b00a00a3f85cf2b4cf5b771e64e606fe3f55

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