Malicious PDF — malware analysis report

Static analysis result for SHA-256 235bbe7313a8091f…

MALICIOUS

PDF

70.5 KB Created: 2020-12-05 07:56:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 143238784347cd84f0b36b36d1adb960 SHA-1: 9ffb9f8cd8d77a7cc60f2ba679a087a5d72e62f6 SHA-256: 235bbe7313a8091f7758d9cca31dba2538084b307c1f63c0901fe038c374ae17
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file is flagged as malicious by a machine learning classifier and ClamAV, and it contains a link to known malicious redirector infrastructure. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document attempts to trick the user into installing a browser extension or update, a common social-engineering path for malware delivery. The embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://gettraff.ru/wb?keyword=biography%20books%20free%20%20pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393016/normal_5f8e9fc6a70fb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ac24393-2aea-4205-b410-4cceaa9c4b83/80979047957.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/78050465279.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/859989ad-08bf-4888-96ab-1aafb619baf2/61840775908.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/16x20_sheds_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/ikon_bling_bling_song.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/31100872765.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/chinese_chess_for_pc.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc181c3403f5353fd9a0f70/t/5fc4e0b308845d0924234f41/1606738100205/jifisoji.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/powevetewanevevifaba.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/joxojox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7874a721-786f-45fe-9b3a-e01619b79421/pebofeletijij.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ebd09955c744b53ba8af/t/5fc1dce3cb3e0f577193fe38/1606540516771/87564505829.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/fazutotuko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1777f6d6-1b45-4f71-bd9d-c23b0e75a19b/95436539478.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/97861116022.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_off0000d32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32E 5624 bytes
SHA-256: 96f3c58b6f216f439e3bbd7d4db30fdcd3e2a7b7b949a2e97d334c3e7456a1a8
font_01_sfnt_off0000e659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE659 11068 bytes
SHA-256: ea7acdf2700ddb4488db77349f00d7feeb6871069848e5a7c30f9b068ebb305e

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