Malicious PDF — malware analysis report

Static analysis result for SHA-256 637237fa002a8ba6…

MALICIOUS

PDF

76.7 KB Created: 2021-05-08 20:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0c28e1e6e3e541a73d5014cfa8a53635 SHA-1: 0e5bf3c571777b3114bcf1ccd38d180ae5d8bbe8 SHA-256: 637237fa002a8ba6a5b7ed08b0aab7177ef8cf8c8f39c2baa310932ca7ab3a96
164 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating a link farm and an embedded URI pointing to a suspicious domain, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'lottery pdf answers' and 'wkhtmltopdf', reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resalured.ru/strik?utm_term=the+lottery+pdf+answers PDF link annotation
    • https://kofifemox.weebly.com/uploads/1/3/1/4/131454106/3606511.pdfIn PDF document text
    • https://ragurinibobuma.weebly.com/uploads/1/3/3/9/133986244/169d1d9a44a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370528/normal_600cc5579a0dc.pdfIn PDF document text
    • https://kigadipokifexi.weebly.com/uploads/1/3/0/8/130813079/bf41c7a70.pdfIn PDF document text
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/tonigexakikonig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488581/normal_600baeaf6ad04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501484/normal_602f4fbea3f55.pdfIn PDF document text
    • https://josozigigararu.weebly.com/uploads/1/3/2/6/132681886/3157625.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_43927773086d4ede82db21d6b5489e6b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/ixl_free_math_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/lagu_on_my_way_pubg_planetlagu.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/72183873398.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/xesatujejitokuvonakefow.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/numudigaruzezezagewidikin.pdfIn PDF document text
    • https://564fd4a8-0e6d-4f97-813a-a14a70c45316.filesusr.com/ugd/f90d28_086a74da6cd44763b5d3781bceef8f13.pdf?index=trueIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_db6f72454927450ca6b1361f36a712d5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/1st_birthday_party_planning_checklist.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/vezupamavoxoza.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/wopalurezefaxelolewili.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/sodusugabugorasemawem.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/71591256342.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/dakukiditapepebotosa.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/1278650875.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_off0000ed24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED24 5272 bytes
SHA-256: bd98374f59b8332a54ec2c94a0ad96f5290ac3da5dd7b4a7e8a315d3992c0c33
font_01_sfnt_off0000ff22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF22 11328 bytes
SHA-256: 6cdf8fb72044ed98d2cbf5802d69a7569ee7440f24049762fef863c43cb34f62

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