Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ec2359ca410419…

MALICIOUS

PDF

74.9 KB Created: 2021-03-12 00:52:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 91bad4a358b0cafd839a79d2f7bdc332 SHA-1: f75bde1abb6501d5470e5d5b77cea394c365b9a6 SHA-256: 65ec2359ca41041907ec0af95c0843e2d7fc794f7296062b961f8426be6b0bd2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF documents, indicating a link farm or spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/award?keyword=tratamiento+endometritis+puerperal+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451220/normal_5fe8afaaf422b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499021/normal_601344f514ef2.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/hbCZmhi/sedetokab.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/idu7hie/clubhouse_invite_link.pdfIn PDF document text
    • https://redojakora.weebly.com/uploads/1/3/2/6/132682723/besuwudomunoxu.pdfIn PDF document text
    • http://xifutipixa.mywebcommunity.org/cambridge_placement_test_for_adults.pdfIn PDF document text
    • http://rezexepenoma.scienceontheweb.net/how_do_you_reset_a_robertshaw_thermostat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450723/normal_600e257ebf8ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421630/normal_604913d18554b.pdfIn PDF document text
    • https://vutubazedo.weebly.com/uploads/1/3/2/7/132740780/xogofepizavajuluno.pdfIn PDF document text
    • https://cdn.sqhk.co/lebapivi/NNwjhae/dead_paradise_2_hacked_unblocked.pdfIn PDF document text
    • https://delazodudiz.weebly.com/uploads/1/3/4/5/134591817/vajepan.pdfIn PDF document text
    • https://sudefenumub.weebly.com/uploads/1/3/5/9/135984534/worilawuru-buxorej-vekofutid-xalobizolos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504870/normal_60265223d473d.pdfIn PDF document text
    • https://zizovotitimojuv.weebly.com/uploads/1/3/2/7/132712514/sivaludibex_ditadedu_tipaju_zebepo.pdfIn PDF document text
    • https://cdn.sqhk.co/bikuwizatag/mcGzbif/48280170076.pdfIn PDF document text
    • https://cdn.sqhk.co/bonidanem/1Rvwibl/43805996459.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wodowepakimeko.onlinewebshop.net/27143837624.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/miglior_antivirus_gratis_android_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/best_indian_veg_food_for_dinner.pdfIn PDF document text
    • http://dojafeduzig.myartsonline.com/risexamujapiduxoximis.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/10518132349.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/living_on_a_prayer_trumpet_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/8322178495.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/80748392605.pdfIn PDF document text
    • http://tameladizikep.atwebpages.com/78890205478.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/math_worksheets_for_3rd_graders_word_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/what_is_peer_reviewed_literature_definition.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_off0000e811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE811 5136 bytes
SHA-256: 5ffb3e75cb2e978f10bcc1d0c96041c881cea7b3a5d05335e856143598aebb7e
font_01_sfnt_off0000f96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96F 10528 bytes
SHA-256: b7d067309041f22f4a86158fc82e75fb0a360286d468712a24467865b898c95b

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