Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5fc84cb85c068ac…

MALICIOUS

PDF

59.5 KB Created: 2020-11-11 19:25:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 97a7e803e8507625bef6822367976ef9 SHA-1: 9ce34cba96e8a37ab57f12c175a71b0022200566 SHA-256: b5fc84cb85c068ac3d88e3c7da07e2ba095fd36ff15d82495bdae221f83f967c
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://trafficel.ru/strik?utm_term=pink+floyd+sorrow+lyrics PDF link annotation
    • https://fijesawe.weebly.com/uploads/1/3/4/6/134630878/bubabebakupux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420776/normal_5f9bb5ac43716.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/varolexexus/jenoriwew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fabf570-d8d8-4ec2-9895-ac2df3fcc044/19565605379.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/xamibofevad.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/44503959604.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/035f4ce0-6c01-415c-a786-20296bfadd53/19952044107.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3d03d89-fdef-4117-ad35-62518e59179c/69689660417.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cea1ee4d-e3c7-4538-9405-ab83f4876d46/aziz_ansari_snl_monologue_transcription.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/keirsey_temperament_sorter_ii.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0adf610c-4b66-4645-b29a-c6466f0fc52a/caracteristicas_de_caligrama.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_off0000ae46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE46 5064 bytes
SHA-256: 47a6adeb8e168b12ce050c41cdbee5c9f66af26840abbef1ef9733db1028c935
font_01_sfnt_off0000bfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB0 10048 bytes
SHA-256: 074eddb31d346ae4c6403a36a1896a1252882b077f6e990aa0878c3185fb4ab1