Malicious PDF — malware analysis report

Static analysis result for SHA-256 f32975f85a9fcf94…

MALICIOUS

PDF

76.0 KB Created: 2021-04-08 19:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59289a3a373f4959e0f39fe64b61756e SHA-1: 7c693657d6871cce88fe77112a3ce3ac2555e52e SHA-256: f32975f85a9fcf949a89ff6b9f3aeaf30275fd8734506c586645d1df9ea8a55b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, suggesting a phishing or link-farming campaign. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate an attempt to redirect users to malicious sites.

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://soxebez.ru/strik?utm_term=el+mundo+de+sof%25C3%25ADa+sinopsis PDF link annotation
    • http://zixudivibudizu.scienceontheweb.net/zuperuximipotuwatub.pdfIn PDF document text
    • http://premial.su/1984_study_guide_questions_and_answers_part_2kg0en.pdfIn PDF document text
    • http://ru-dev.xyz/is_eating_wild_game_healthy_for_youbfi0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369923/normal_60468400dcfee.pdfIn PDF document text
    • http://thrivewebs.com/chrissy_teigen_cravings_collection_ukhzjbz.pdfIn PDF document text
    • http://rupazaduxil.mywebcommunity.org/vewumagalafamuvejowejuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465543/normal_6011655411485.pdfIn PDF document text
    • http://xeeewq.xyz/proper_squat_form_malepp72b.pdfIn PDF document text
    • http://taygerr.com/aquatic_adaptation_in_birds_and_mammalsxsf36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505102/normal_600f1f12d3de7.pdfIn PDF document text
    • http://majexifavel.scienceontheweb.net/stock_market_open_tomorrow.pdfIn PDF document text
    • http://gufutaca3.xyz/sawaginonkvma1.pdfIn PDF document text
    • http://cookwellbakewell.com/vox_tonelab_le_preset_listheji4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_543034c4a6ce48ff8f43743bd30e13a9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/af4e610e-00dc-4a53-b0ad-d2698a33af2b/89398794109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cab8f34-a413-4bee-a805-e32905c0f913/acurite_5_in_1_indoor_outdoor_wireless_thermometer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5d60883-47c6-4252-b124-136ac5aba550/fopalawibenelenu.pdfIn PDF document text
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_0412b5ed1dc2431ca7b27e91b2126b8b.pdf?index=trueIn PDF document text
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_28492a223e8b4451931d11a759077d55.pdf?index=trueIn PDF document text
    • https://4de1274e-a26b-4e71-a0d1-d86f0cfee7ee.filesusr.com/ugd/ee4d88_369911e38f854ee38a8fd5bb1b22b3f2.pdf?index=trueIn PDF document text
    • http://donijexufenu.onlinewebshop.net/hp_probook_4530s_notebook_pc_energy_star_drivers.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_off0000e7a8.bin
c4b308e914da9b306b283bb674fd1edfff20515e732572a837e648eb5ead9806		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A8 5104 bytes
font_01_sfnt_off0000f8fc.bin
c1a0a0e35426f295ec8726c031ee5a2e9a68070771354884fbf25c8d7030773c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FC 12276 bytes

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