Malicious PDF — malware analysis report

Static analysis result for SHA-256 a016bc7db7390840…

MALICIOUS

PDF

78.4 KB Created: 2021-04-24 21:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9af43679bcb0c8f93040081414f78d49 SHA-1: 7407dbbb8856b798b544f62814f733985097fb00 SHA-256: a016bc7db73908400bbf6849b60ca9871ca728ac5b09460fd91910a7ce1d32d3
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it's likely a phishing or malware delivery mechanism. It contains numerous embedded URLs, with at least one pointing to a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt.

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://leonvi.ru/strik?utm_term=hisense+portable+air+conditioner+300+sq+ft+parts PDF link annotation
    • http://productwood.ru/how_to_day_trade_stock_optionslywjg.pdfIn PDF document text
    • http://negodebozebe.iblogger.org/bioplastic_manufacturing_process.pdfIn PDF document text
    • http://mavito.online/google_chrome_offline_installer_latest_versionjk53e.pdfIn PDF document text
    • http://spain50off.info/331349363016y0ux.pdfIn PDF document text
    • http://nokirixako.iblogger.org/travel_guides_commentator.pdfIn PDF document text
    • http://meetchat.space/alinco_dx-sr8_for_salebzuhj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xafamikipu.epizy.com/nobiwojemejaxu.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/philips_universal_remote_srp9232d_27_code_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ef34f2c-66ac-4c7e-be7f-935864fdcd57/65688111584.pdfIn PDF document text
    • http://zosatomoviwom.rf.gd/caballito_de_mar_reproduccion.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/4413824984.pdfIn PDF document text
    • http://wijotifiku.rf.gd/keylab_49_essential_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0cef259-cb23-41fc-b88b-5c477839f4a2/the_righteous_mind.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc17814e-1a94-4797-be84-79ecc1a9cf53/krk_rokit_5_g4_pair_price_in_india.pdfIn PDF document text
    • http://lozerur.rf.gd/types_of_bariatric_surgery.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/flipkart_online_shopping_double_bed_sheet.pdfIn PDF document text
    • http://xafotibelazes.rf.gd/729512149.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1bdc279-86b3-41fd-acc8-e7b745c02dd5/89066895935.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94000454-caa7-44c9-b83d-827b71817fad/luvigezejamakutix.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_off0000f36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36F 5684 bytes
SHA-256: 1c49c72d6b767138e42161802a6fff2ba068f23d79ed2b0cfbc78fbec4c33bef
font_01_sfnt_off000106c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C0 10852 bytes
SHA-256: 5373b326578e1db17dd91236002578a875dc7a8235a711d4da471ac12a0b10a5

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