Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8baa43d8076de16…

MALICIOUS

PDF

72.5 KB Created: 2021-01-08 19:03:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: c10599f890be9c483d6b1b249b41e79e SHA-1: 794eb6f2fef874823673a26613a6fe07add11788 SHA-256: a8baa43d8076de164e3fbd9fce514efac00e0e0ad549750e957a328da13a579e
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs, suggesting a link farm or phishing lure. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to external, potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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.
  • 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/aws?utm_term=android+10+s8+active In PDF document text
    • https://static.s123-cdn-static.com/uploads/4411270/normal_5fdd3a59376f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454302/normal_5fc283df4e436.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453575/normal_5fa1b6fddf972.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421477/normal_5ff108c238fd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365555/normal_5f8cc656bc079.pdfIn PDF document text
    • https://sufifova.weebly.com/uploads/1/3/4/7/134736026/1534950.pdfIn PDF document text
    • https://xosovixa.weebly.com/uploads/1/3/4/3/134318585/15d81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5fbe83809289f.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/41c32888-a406-42c8-93f7-0a80b46a33af/zolepu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4af548d-3812-4fce-a9a4-aad6f7db79ee/graphic_design_apps_for_ipad_pro.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/61523623203.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/shawn_mendes_songs_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4627d0b4-af03-49b2-b0d6-af3a47f5118d/xisuziterivuvufe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e93ce20d-ce07-481e-803f-e110eb3f9bc6/wirefuzinipawivejiwiwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b88624b0-bcd3-4aa9-9c26-5dd63c5c6d12/blue_crab_internal_anatomy.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_off0000de87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE87 5336 bytes
SHA-256: 399836b6f7fde64e2a8b1a6fe068fb100a248c7c4eb42b650a0529c0a93c6ab0
font_01_sfnt_off0000f0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C9 10748 bytes
SHA-256: e1b95e82cf4c0125efeee9aa19611aa09de148f6075916b2388af6808283e7b4

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