Malicious PDF — malware analysis report

Static analysis result for SHA-256 887eff6b5c790c77…

MALICIOUS

PDF

70.9 KB Created: 2020-11-18 13:41:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: fa997cb5a8bdb21cc01e64d9aec3a36e SHA-1: 2e482a0d4e4a12ab62af2591d803a2fe0c2a5a09 SHA-256: 887eff6b5c790c77ab0352f17ae9dd9df412f915f06f24d3faace4c793b8b6e2
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a ClickFix paste-and-run lure. 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 0.9997

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://trafftec.ru/123?utm_term=how+to+use+vietnamese+keyboard+on+windows+10 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418991/normal_5fad49f7c0e8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378599/normal_5fa44d92d621d.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/3e5c30f2-4cda-486f-b169-b6d55fa0986a/81241619135.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1086f3f-c32d-497f-b39a-730bdbe512a2/36249198282.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0341f119-b681-4ade-8708-adcfa8dcdedf/justified_season_4_torrent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25cc4d8e-45be-4696-a64e-7f71752b6c28/rogefodevudirabufa.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/head_pump_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad526d9a-6464-4aed-94f9-6a97f80070d8/44946992985.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/fanan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a35e92c-0d6c-4e59-a610-42334ff9bacc/elements_of_music_notation.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/fipaganikaxarelotuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb183b61-aa68-4590-838b-174fef87bc60/54175759421.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/pepakesogef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddbd804c-3018-418f-b402-e3228749d40a/mi424wr_firmware_update.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_off0000cd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD89 5552 bytes
SHA-256: 90f6133e9e09609598d186b07271fc3787ad01725e754295a7d95f8426f484f0
font_01_sfnt_off0000e067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE067 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off0000e8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F5 11428 bytes
SHA-256: f5eb3c8d7b7650cbd9dcf64f4b6150e12936f97555329ab60f7156fe51ab475b

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