Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1512dcb2426a72…

MALICIOUS

PDF

68.4 KB Created: 2020-11-26 05:40:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3e47553ec070ed9e44b39225e41fe7a SHA-1: 63c6b6fad95ecdbbfcb81eab61d06fc3f7bb9959 SHA-256: da1512dcb2426a72c2b5aa6b665b3da187aa3b07a0e2e4f446c8783216020cbb
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM. The primary URL, https://ggtraff.ru/strik?utm_term=how+much+do+vaccinations+for+india+cost, is identified as a malicious redirector. The ML classifier and ClamAV also flagged the file as malicious, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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=how+much+do+vaccinations+for+india+cost
    • https://cdn-cms.f-static.net/uploads/4470521/normal_5faf106f0914c.pdf
    • https://cdn-cms.f-static.net/uploads/4460686/normal_5fa2aadee74f6.pdf
    • https://dakitejowavuri.weebly.com/uploads/1/3/4/6/134669034/a82a2.pdf
    • https://cdn-cms.f-static.net/uploads/4367289/normal_5f8751ddb12a1.pdf
    • https://jinajifija.weebly.com/uploads/1/3/4/8/134889339/ea02ae358085c3.pdf
    • https://cdn-cms.f-static.net/uploads/4368504/normal_5fb27964713df.pdf
    • https://cdn-cms.f-static.net/uploads/4373243/normal_5fae2ba9997a7.pdf
    • https://cdn-cms.f-static.net/uploads/4404285/normal_5f9461bc21252.pdf
    • https://suzagosezamonu.weebly.com/uploads/1/3/4/4/134446802/butabawofejoki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0eaa5846-37c7-4194-92c7-4e6a92c0592e/125_as_a_fraction_simplified.pdf
    • https://uploads.strikinglycdn.com/files/9afc87cf-7f82-4e6b-aadb-1485ba840f4d/sugavoxutivasij.pdf
    • https://uploads.strikinglycdn.com/files/c641342b-df4f-4d11-b1f4-b3fdebf51325/bogilusoledasufifoviwa.pdf
    • https://uploads.strikinglycdn.com/files/f85c23a7-c7a6-4519-8b3a-23644d1046c0/portland_kindergarten_writing_units.pdf
    • https://uploads.strikinglycdn.com/files/8d8ccb27-ff69-4d77-8b10-f45a9cc97d9e/tangents_and_circles_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/1c9a07ee-5298-4edd-b87b-5fe786e4506f/enfant_de_palestine_paroles.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_off0000cd9b.bin
8beeec525b13c554f166f86a788a32c070c44d5b6dd09f0181ac2a62d39ae951		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9B 5344 bytes
font_01_sfnt_off0000dfb0.bin
3d60e2d3518af8de58e63df716c27fc42abfc2ba86cb2587242902fddb1f1716		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB0 10748 bytes

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