Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4e24fb52ef8134…

MALICIOUS

PDF

91.5 KB Created: 2021-03-08 11:34:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cc26d29bd2d56c53fcc90412f802d060 SHA-1: 798aec2b4880bfe290224b0e4364c6274b999e8c SHA-256: bd4e24fb52ef8134d347648c8e82b3561bc6885f891509ef8f6c4e3c45d7f431
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://dafemum.ru/aws?utm_term=nephew+meaning+in+kannada'. This, combined with ML and ClamAV detections, strongly indicates malicious intent. The document body is heavily obfuscated, but the presence of embedded URLs and the redirector link suggest the primary goal is to lure the user to a malicious site. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://dafemum.ru/aws?utm_term=nephew+meaning+in+kannada In PDF document text
    • http://community-day.ru/56389800942izvrp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417675/normal_5fe9d9ee1f429.pdfIn PDF document text
    • http://pekefosijemibi.sportsontheweb.net/32821018532.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376879/normal_602d8d1a0a8be.pdfIn PDF document text
    • http://ladiluvame.mypressonline.com/86039086643.pdfIn PDF document text
    • http://mp4.design/pubupitawixokoxuxomadtbf.pdfIn PDF document text
    • http://tejowigasinafu.getenjoyment.net/american_born_chinese_essay_topics.pdfIn PDF document text
    • http://lightstart.xyz/506611058072u7b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475382/normal_60226dbf58ae2.pdfIn PDF document text
    • http://dotenipago.medianewsonline.com/what_is_a_level_1_leader.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471475/normal_60225424a9bc3.pdfIn PDF document text
    • http://usechambre.xyz/93395237234zej9j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445326/normal_6030450629c76.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/fall_foliage_report_arkansas_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/58882551459.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/33337649085.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/3811760264.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/bcbs_of_nc_appeal_form.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/wipevojimikewurovazukewar.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/sample_drink_menu_template.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/bermuda_weather_report_10_day.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/example_of_conclusion_in_industrial_training_report.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/attach_excel_file_in_excel_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/lilonozuresozibeno.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/47157216286.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000fc3d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFC3D 16792 bytes
SHA-256: c17c64c8544408b6dd96b72a23845a465bc3de3d5da3780f4f60feabe881b25d
font_00_sfnt_off0000ea9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9F 5192 bytes
SHA-256: 8531dee4f1aa7d501d38505efbbcf8c0bc9af66c9067264a7af776577143ffd2
font_02_sfnt_off000122d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D1 12064 bytes
SHA-256: 850406e8bdb1e49bde0e47789be062a92e7d34073eacd2d5af80280b2bf4fbd0
font_03_sfnt_off00014aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AED 16096 bytes
SHA-256: 9853a4a918762215dfcba51349555ff48d39e56332efe18e2f333ca30d8a5b61

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