Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9510632965cfb4b…

MALICIOUS

PDF

81.1 KB Created: 2021-03-25 05:48:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0182b71a2ed9c1cb5a51f001306ad36d SHA-1: bb66f05eac5510d89246c0da5355d6754985f255 SHA-256: d9510632965cfb4b2a334145f632c8aa70a042e9d1ea075fa69acd737e7bf7c5
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to a 'Myers briggs type indicator test free download'. The primary attack vector is likely spearphishing, with the embedded link serving as the initial lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=myers+briggs+type+indicator+test+free+download In PDF document text
    • http://mylic.ru/the_long_winter_trilogy_reviewe7quk.pdfIn PDF document text
    • http://xuxikurov.mygamesonline.org/pewanin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412387/normal_6000d8e3f01f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416921/normal_60187621ac6ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494668/normal_5fd64967f2051.pdfIn PDF document text
    • http://metalllift.ru/zombie_sticker_ps4uho17.pdfIn PDF document text
    • http://mabay.fun/dell_precision_m6800_laptop_specificationskj89m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471091/normal_604513bdefd40.pdfIn PDF document text
    • http://tonedomopoja.scienceontheweb.net/metrology_and_instrumentation_ebook.pdfIn PDF document text
    • http://mumopajikex.mygamesonline.org/10th_social_new_book_english_medium_in.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383327/normal_5fee140f7c7ca.pdfIn PDF document text
    • http://gojevomarokabe.getenjoyment.net/zewejigisumubezise.pdfIn PDF document text
    • http://pasendapp.online/124946386592efu.pdfIn PDF document text
    • http://fukerijinexin.mygamesonline.org/guitar_chords_guide_for_beginners.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_5e16cefe095c4746902d913f9c067cce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee094cba-6cad-40e5-af88-f1a78db055ad/xomepuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb7cb514-31d4-4264-a48b-fbbb360a5b1d/andrew_wommack_ministries_prayer_line_phone_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3404fdb7-04aa-498c-8e4b-9e29741e7a22/spider_man_video_game_2020_xbox_one.pdfIn PDF document text
    • http://wejufutaz.onlinewebshop.net/aeronautica_imperialis_rules.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66549e00-3386-4142-9ba4-c2f505a7de96/raymarine_c80_radar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e67d490-675d-4825-a01d-3e8dcad7873d/kikavotisofikidoxixus.pdfIn PDF document text
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_66627c8786fb450c8d3caac15c6e2d56.pdf?index=trueIn PDF document text
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_56ad11ca8cdb48d5ae6feb0945051e50.pdf?index=trueIn PDF document text
    • http://xiniwipilanaju.atwebpages.com/how_do_you_describe_a_rainbow_trout_grow.pdfIn PDF document text
    • https://46fb9a51-9e16-4ad8-811e-2f7ed01702f7.filesusr.com/ugd/53363c_f4f67c9199f04007a14561bb4856d2e7.pdf?index=trueIn PDF document text
    • http://bitines.myartsonline.com/capresso_infinity_plus_conical_burr_grinder_manual.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_off0000fb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB62 5664 bytes
SHA-256: 907397cbbefbd274236242caf0b3ca741edd39b6cb6ee98080809dea8e0e4195
font_01_sfnt_off00010edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDC 11268 bytes
SHA-256: 648bebe81a5128feadd7affe23f9756b384b039fc3fbd60b928241ad21edf1d9

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