Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f7553b38cc37ef…

MALICIOUS

PDF

67.0 KB Created: 2020-12-15 21:47:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8ca7e8bf879e55e561e793024d10156 SHA-1: d5422988df0ed0b3cac849d4f9efacd1a3b705cc SHA-256: e6f7553b38cc37efe8e520c7a59ab5ad6c1291a5fc6ffdfd507fa90cd1a4d051
230 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a large number of external PDF links, suggesting a link farm. The ML classifier strongly flagged this PDF, and ClamAV detected it as a phishing trojan. The document body, though heavily obfuscated, contains references to 'Reddit upvote bot' and urgency lures, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://cctraff.ru/123?utm_term=reddit+upvote+bot
    • https://nusoselif.weebly.com/uploads/1/3/4/4/134470887/3955347.pdf
    • https://pukogapuwobar.weebly.com/uploads/1/3/4/3/134307851/guwefudogaletej.pdf
    • https://lezuzanufebaj.weebly.com/uploads/1/3/4/8/134873312/3adb4c9454c7.pdf
    • https://rofosuvobatijam.weebly.com/uploads/1/3/4/6/134661532/gefesujon.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bokofapig/grand_lodge_of_alabama_mobile.pdf
    • https://static1.squarespace.com/static/5fc10b16085bf90c0efde155/t/5fd139d45c36332d08926657/1607547348458/descargar_ball_brawl_3d.pdf
    • https://static1.squarespace.com/static/5fc7b79f5f0d731e16ae0415/t/5fd74b9c9264095525f05d05/1607945117224/vatican_2_summary.pdf
    • https://static1.squarespace.com/static/5fc294961452f90b7fefeff3/t/5fc46c85145a8629dc3e8af6/1606708358200/76269018641.pdf
    • https://uploads.strikinglycdn.com/files/d9ec9842-5937-46d2-a1a9-824cc200432b/tapuru.pdf
    • https://static1.squarespace.com/static/5fc54b8ff7cf8c754047d5ed/t/5fd6b08a481cfa31add3dac6/1607905419977/vizopevazijoledugiguvojo.pdf
    • https://static1.squarespace.com/static/5fc571d8a5bc066edfc42d69/t/5fd6fb95481cfa31addd93e8/1607924631230/96563296400.pdf
    • https://s3.amazonaws.com/pibabopuduj/special_occasion_speech_award.pdf
    • https://uploads.strikinglycdn.com/files/bd9e5fe5-1ed0-418d-a56d-4e86c200c46c/zabinoduvamibesis.pdf
    • https://s3.amazonaws.com/feborobegibew/34975101877.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccd5.bin
9605bb2dc52e1b98aa78f19e41d129f4168ded55640e2dcdb4c69d73586aa640		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD5 4644 bytes
font_01_sfnt_off0000dcbc.bin
07bdde3fbe7bf1bdf76616fd81e898c4127999f30aaad740e9ded928039ebe65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBC 10344 bytes

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