Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9de4d669abd2307…

MALICIOUS

PDF

104.0 KB Created: 2021-01-13 15:39:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a1c06e95d793270f1131143f7d3faaf4 SHA-1: f49bdf53b0d0f438125a2e6a5cb079b99e242a8f SHA-256: c9de4d669abd2307299479fd6f5c7d2550f3c2870ff132f3130f3b1e69eb0c72
182 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a critical heuristic firing for a malicious redirector link pointing to 'https://traffking.ru/aws?utm_term=multiplying+perfect+squares+worksheet'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body text, though partially garbled, includes references to a worksheet, aligning with the redirector's URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://traffking.ru/aws?utm_term=multiplying+perfect+squares+worksheet In PDF document text
    • https://site-1173325.mozfiles.com/files/1173325/mufuj.pdfIn PDF document text
    • https://cdn.sqhk.co/belumozobu/iphbJih/jio_mobile_recharge_offers_karnataka.pdfIn PDF document text
    • https://site-1174906.mozfiles.com/files/1174906/rojobexuvixuzejano.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453342/normal_5fef81e0393c9.pdfIn PDF document text
    • https://cdn.sqhk.co/sorubajuzoxe/SmU3jhC/xunepugizowatoxewufap.pdfIn PDF document text
    • https://site-1178770.mozfiles.com/files/1178770/82236539137.pdfIn PDF document text
    • https://site-1167931.mozfiles.com/files/1167931/photosynthesis_lab_gizmo_answer.pdfIn PDF document text
    • https://site-1172455.mozfiles.com/files/1172455/text_font_generator_encode_messages_pro_apk.pdfIn PDF document text
    • https://site-1171882.mozfiles.com/files/1171882/dusemevax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pegek/dewalt_power_inverter_1500_watt.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/40667539689.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/exponent_rules_maze_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/reportage_banditisme_marseille.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/66401369958.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/39690658640.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FD1 2828 bytes
SHA-256: b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a
font_01_sfnt_off000159cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159CC 5664 bytes
SHA-256: 85953f721feab265e39f3d3e64d729638c936fb84e21a7ae5fa851b04af1e8b2
font_02_sfnt_off00016d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D43 10336 bytes
SHA-256: 4c91ceaa6da687292409bdab7c99c0f5dc08bd189821ef22dd3f2500d21a2a50

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