Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ef261b8efdbfe5…

MALICIOUS

PDF

66.2 KB Created: 2020-11-20 09:34:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7ec910fc8ef2c3ec1938d78a85b04983 SHA-1: 9cbc74f4d6941b23da95083901177cade4a946e1 SHA-256: b7ef261b8efdbfe5ec4caeb6a9446de4494477a0ff169e502ac6e00c6bb32dfc
96 Risk Score
Tags
free-cdn-ebook-manual-lure

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 external URLs that direct users to attacker-controlled resources. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/123?utm_term=mwscas+2020+call+for+papers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475580/normal_5fade0ee42536.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366359/normal_5f9ec90708c7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375522/normal_5fa4c39286878.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366964/normal_5f876219b20d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450045/normal_5faf119aee069.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412897/normal_5f9432cd06b2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380701/normal_5f8c71f46d4cc.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/7834bf2a-24d1-4942-98fa-b54f37a539f4/zojojosif.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/email_format_cbse_class_9.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54976814-52b2-4afa-8c90-36b4f871d5ff/ganasute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/219103c1-3a15-41f0-9609-f0fb2af3aad3/how_to_get_super_smash_bros_brawl_on_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/803f242b-4c51-484d-a728-275ffc9b1e8f/98009266811.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b037bf62-6393-48eb-98fa-222c90b6885f/92737327618.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90217b83-c9d6-443f-a4fd-00bc06f43733/foramen_of_the_skull_labeled.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0df8d0f9-9f5d-4da1-9159-f69bdef01590/notijuf.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_off0000c719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC719 5380 bytes
SHA-256: 449d0b5547c25360de982ce63ec7561c1230b9a87082c2446a3da157a9fa7abb
font_01_sfnt_off0000d994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD994 10128 bytes
SHA-256: 993b8f7a0c5bc0dfb3aeb1e9fe8e7a925b00622f93b906dca6a46c826ed4e302

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