Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6b42dd1b973ad4d…

MALICIOUS

PDF

90.4 KB Created: 2020-11-18 04:27:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 55f72897982731c10beee975657cc245 SHA-1: 748b1030f3403326a1d0eb375a237f9b1f416a71 SHA-256: e6b42dd1b973ad4d6123e8c4f3a02b991bd178770a414263d0d951f4c0a67912
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm designed to redirect users. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffmen.ru/strik?utm_term=hidrograma+unit%25C3%25A1rio+scs In PDF document text
    • https://litovabijoku.weebly.com/uploads/1/3/4/6/134666457/2106755.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411686/normal_5fa1ddcdcb564.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482413/normal_5fa9969f71416.pdfIn PDF document text
    • https://viwuwobigoku.weebly.com/uploads/1/3/1/3/131378942/8414811.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422622/normal_5f98cc992a8d3.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/67798710-348b-40c3-8f28-d6734b5ad8f7/the_primary_trigonometric_ratios_wor.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/23820935738.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84020b80-71a4-4528-bd22-7fa7d21e0364/bartholomew_and_the_oobleck.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/489a5dd3-985e-48d7-a8cc-294601ff4893/teni_partynextdoor_mp3_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bfadce9-029f-436f-86f4-f24d0d84cbde/sajuxuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/466e2533-cfd7-493e-abe1-8e3d4f3cb763/dajiluravixapepatidi.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_off000112d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D0 5424 bytes
SHA-256: 52862b52aae259e840daba54904cc94811f5c86b826b9a73b7e79db83ee34095
font_01_sfnt_off00012497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12497 2256 bytes
SHA-256: 19542df3a930d02cf42965fc1a1909c46232cc34b9877ca065ff3cf2c1adffb7
font_02_sfnt_off00012e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E22 15032 bytes
SHA-256: 251d9a611c4f4a2bd49c8e494b3e526d378eca215e42f929495073fb105fc99b

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