Malicious PDF — malware analysis report

Static analysis result for SHA-256 17b53286b0c67609…

MALICIOUS

PDF

69.1 KB Created: 2020-12-07 00:44:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f8aeb90bddbcf3ad411914706eba6e97 SHA-1: 9d3bd99fd5a3ccc31d8c2cabbdf9016f9953b261 SHA-256: 17b53286b0c67609e4d1698f2cec0a64b83d94c56af68c0bd23fc810de9634b7
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure and a PDF link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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://ggtraff.ru/strik?utm_term=clima+cd+acu%25C3%25B1a+hoy In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383170/normal_5f9b77f1e9a07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371495/normal_5f8d6f5bef7d4.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/d96ddb407408.pdfIn PDF document text
    • https://rebazizezasij.weebly.com/uploads/1/3/4/5/134586802/d680a56bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369524/normal_5f88182563fc4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e33e4a19-c7c1-401e-882d-245aab840607/sexodifuxisatoputota.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0da75085bf90c0efcd65a/t/5fc30afe9d79364840f21e9d/1606617855295/witch_halloween_costume_baby.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/wegelagujemetoninepemu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd17de31dcc34bf48e0133/1606227935274/41175067734.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc15d59403f5353fd98fe44/t/5fc9833d52b5874c858746a2/1607041855205/digi_customer_rewards_program.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/citizenship_certificate_form.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc367fa116eb00e3c5be3f0/t/5fcd5adccded405bb8e9d815/1607293661772/kilamekinivonalawuzere.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe037df81c9a2a0c68e210/1606288253616/one_sample_t-test_in_r.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2fc780b6b03258f43150d/t/5fc515449ee0f32b87f4e948/1606751561598/27071962621.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_off0000c599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC599 4820 bytes
SHA-256: b6e68d61d6d31b5449f63f5d3dd894b3bc1605ecdb65d2adff1fa10afbee2b0c
font_01_sfnt_off0000d5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BC 10368 bytes
SHA-256: 868202c207a5a2dac5313b5f7a64373cc360bfe579463fc867662f85e57a679d
font_02_sfnt_off0000f7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F1 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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