Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7fc83e19437df8c…

MALICIOUS

PDF

119.1 KB Created: 2021-04-03 01:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: bc9b97ed725715ec63b5f03228aee623 SHA-1: edcda20c50f550efeb8870dfb0bf39ab02eef668 SHA-256: b7fc83e19437df8c4d5104baba9bc4adbb8152d98054a961bae7d2d1fce26aaa
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with a significant portion pointing to disposable hosting and employing UTM parameters, indicative of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ponafet.ru/strik?utm_term=the+vegetarian+book+meaning PDF link annotation
    • http://fionainthefield.org/galibmmlov.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://nakanilo.club/noxararexusajsgbfh.pdfIn PDF document text
    • https://cdn.sqhk.co/kibizatududo/ggdgdgf/brick_game_pro_19._9._0.pdfIn PDF document text
    • https://penopetidurip.weebly.com/uploads/1/3/2/8/132815040/posodil-xeropemotuxefix-dutaja.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/dijmhgG/30637951512.pdfIn PDF document text
    • https://cdn.sqhk.co/denirinodo/ajaYjeP/87132345880.pdfIn PDF document text
    • https://kavawemufelatat.weebly.com/uploads/1/3/5/3/135394651/7665814.pdfIn PDF document text
    • http://idealsit.fun/78775133584b4bhq.pdfIn PDF document text
    • https://pudevezogezuk.weebly.com/uploads/1/3/4/5/134528534/05d1baf.pdfIn PDF document text
    • http://meetcabinets.xyz/36486746528movqc.pdfIn PDF document text
    • https://cdn.sqhk.co/lekibapufe/jcM8ugj/bazixazedutitikimoruxuzo.pdfIn PDF document text
    • http://meetchat.space/casey_at_the_bat_poem_questions_and_answers_commonlit359n0.pdfIn PDF document text
    • http://domastmsk.space/943032615569jnw8.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolaseja/iap0ha9/german_imperative_form_of_machen.pdfIn PDF document text
    • https://jizonuwuko.weebly.com/uploads/1/3/0/8/130814311/rivedigugalokepixo.pdfIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4d40cbb-0c20-4eba-9cc1-a11a3edecb51/romazewelafade.pdfIn PDF document text
    • https://0e75ab8e-f6a1-4360-bef2-1d94e06fde4e.filesusr.com/ugd/c0518c_465d1da7bcd743efbcdf06ee0c512294.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d4dfad2-7910-455e-a477-c244de7636ea/tigovu.pdfIn PDF document text
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_73af03eb802244418b003a6dd068d606.pdf?index=trueIn PDF document text
    • https://aca56392-15ae-48e8-982c-fdf6c4ac0dc3.filesusr.com/ugd/00c070_f30a39e3eb094968942347ef8ac0fb8c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f59fb1a-6e19-4427-8899-0adde2e6757c/mrs_peregrine_home_for_peculiar_children_books.pdfIn PDF document text
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_757c5c4976a64c9aa5072db56beda184.pdf?index=trueIn 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
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000171d1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x171D1 3736 bytes
SHA-256: 8491b53297a38d7d096ea08e486e5787ab01b17a4fe098d24cba8847e3cea703
font_00_sfnt_off00012fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCB 10328 bytes
SHA-256: 8598ef7c7bb848283bc741a1afa5efb848a5614c7eff4f617baaeb00ac41c432
font_01_sfnt_off00015264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15264 5104 bytes
SHA-256: 4f65b31531d57b6c790d879b5109a54580e8ec2a724813e455eea3aaff0c9979
font_02_sfnt_off000163a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163A3 3872 bytes
SHA-256: 7785374c3c8d51bdde26645e855e8e999c92845c64242a93924083a6de515b9d
font_04_sfnt_off00018033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18033 18180 bytes
SHA-256: 7e2538b80476cb7c2055f2f11b57fb8ef9830b7b4114a30621b2a0b1b4633432
font_05_sfnt_off0001b41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B41C 17308 bytes
SHA-256: d7895f1689651dbd64a8ecec74de3da89661674ffd3a8582a3c5855392b53d70

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