Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13cc6545c763bc1…

MALICIOUS

PDF

76.0 KB Created: 2021-03-01 03:46:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d00e545ce43ae4dab052fb83739301c3 SHA-1: 3357d790df8624e8ec249806d5859efc4ee82b7d SHA-256: c13cc6545c763bc1ea945fedf4638dfab69f47d189050ce624566e46afefca8c
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, strongly suggests a phishing or link-farming attack pattern. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=pentax+k1+vs+k3ii+image+quality PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417830/normal_600bf4cf7ff59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426960/normal_5fd62c0e55162.pdfIn PDF document text
    • http://kyukty68.xyz/mizepanopexiko2culh.pdfIn PDF document text
    • http://xafopawiki.medianewsonline.com/16732931994.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427097/normal_5fc68377a3857.pdfIn PDF document text
    • http://bcpzonasegurape2-viabcp.com/answer_me_please_traduo_para_o_portugus08j45.pdfIn PDF document text
    • http://meine-gebuhrenfrei.com/five_little_ducks_piano_sheet_musickotiv.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/chemistry_data_booklet_a_level_edexcel.pdfIn PDF document text
    • http://mazafaka69pussy.online/practice_unit_conversions_worksheetynfeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://totuxivez.onlinewebshop.net/yamaha_ypg-635_midi_driver.pdfIn PDF document text
    • http://pamilov.epizy.com/sad_emotional_song_status.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/25277950968.pdfIn PDF document text
    • http://xobabikek.rf.gd/application_letter_format_sample.pdfIn PDF document text
    • http://buwolewunajoj.rf.gd/72390771309.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/mikotebi.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/uc_browser_video_er_iphone.pdfIn PDF document text
    • http://najanezajuv.epizy.com/37039506328.pdfIn PDF document text
    • http://xekabotiwuker.atwebpages.com/xenamunisoz.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_off0000e7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FF 5548 bytes
SHA-256: 6e75dcbb07bde7c515175ca8e6fe8fb4e54da99af628de1ce2e7509f4dad5a8f
font_01_sfnt_off0000faf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF1 12668 bytes
SHA-256: 85f6dd093964b4877eb62e9d2979aef9fd54572bf9b4282b8d32bb38ca0fa175

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