Malicious PDF — malware analysis report

Static analysis result for SHA-256 19e443f110003ba3…

MALICIOUS

PDF

69.1 KB Created: 2020-12-06 18:44:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c1911666502049c4d10b0cbb25e9c244 SHA-1: b5a13f2e9c6838cb5ad767f3b1af1ea477f014fe SHA-256: 19e443f110003ba35ec6f570abbf1d53fdc8dcd2e4063043ef863775a8d71aad
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a ClamAV detection (Pdf.Phishing.Trojan-d2568dad23a94d95) and an ML classifier. It contains a large number of embedded external links, with one pointing to 'https://trafffe.ru/strik?utm_term=sulfur+powder+is+metal+or+nonmetal', suggesting a phishing or link-farming attempt. The presence of PDF_SEO_LINK_FARM heuristic indicates a deliberate attempt to create a link farm.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/strik?utm_term=sulfur+powder+is+metal+or+nonmetal PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416938/normal_5fa1aab55849c.pdfIn PDF document text
    • https://tugarekuxu.weebly.com/uploads/1/3/4/3/134307697/7722857.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418791/normal_5fca82db4e7a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381291/normal_5f8b74499b3d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486997/normal_5fc952c7bc853.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530868/normal_5fc0554caf77c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503279/normal_5fc2510fa935f.pdfIn PDF document text
    • https://kevapesezivobi.weebly.com/uploads/1/3/4/8/134893959/7894198.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369932/normal_5f9c7df471d62.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/57787898578.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1c049c6d9645836281f45/t/5fc28126f3de5e49b5b58695/1606582568088/my_english_by_julia_alvarez_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/909b26be-0af3-41a6-91de-a84db09d6be8/19498415627.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/teaming_with_microbes.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_off0000d0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A2 5380 bytes
SHA-256: db92f16c7a08fe04e656b6c9d6f13c429f68492f0e21a5e2691932df73873eec
font_01_sfnt_off0000e2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E8 10876 bytes
SHA-256: a29bd68bf65d0ea3c4c084fc29a8c75e9ef905c3bb1dc10f75bcc271b739018e

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