Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ad3f8e8f52706b…

MALICIOUS

PDF

69.6 KB Created: 2020-11-14 20:10:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7a0a3447bb6f171422a3d2583c3befaa SHA-1: 145b02d5fb3c7611b0a8687d686b9f1e448732ad SHA-256: b4ad3f8e8f52706b889a7ca9bf9fa6f5388031169cc718f1a5873da2b5af42dd
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 0.9997

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://trafffi.ru/aws?utm_term=email+writing+format+in+english+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406812/normal_5faa1ec28fca9.pdfIn PDF document text
    • https://mixosikopas.weebly.com/uploads/1/3/4/3/134383158/pufudalijudirufoki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369143/normal_5f99e425b76d6.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/metakibeme/juvubir.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/shorter_oxford_english_dictionary.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/28618329048.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/mini_husky_for_sale_in_new_york.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/177cd204-b433-43fb-ac39-7e0ca5ff95de/xapobovujutotopufikixa.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/arte_greca_classica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b08e984-a982-4c24-b4a8-975c046aeca3/binding_of_isaac_everything_is_terri.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/68741845441.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_off0000d35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35D 5504 bytes
SHA-256: 04f3f9510039852cd2672e8dd30fa76ba5de8f42be01ccf64657c8a465d384e7
font_01_sfnt_off0000e5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FF 10400 bytes
SHA-256: fd203844012bd2669f73b81826c0987ea8cf694d5fb022815f72bf4a5afe4284