Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b2c03d93115378c…

MALICIOUS

PDF

70.3 KB Created: 2021-01-04 05:12:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e863ce101e56c836122a25798024c4ac SHA-1: 79b2eff8911904b938fe8152c087819c01bda69a SHA-256: 9b2c03d93115378c7536b89572024f4ec455d9cd94dbd25ef8d548f6935798ec
214 Risk Score

Malware Insights

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

This PDF file contains a link farm and a malicious redirector URL, suggesting a phishing or scam attempt. The embedded content, though heavily obfuscated, appears to be related to search engine optimization and link distribution, likely to mask the malicious intent. The presence of a known malicious redirector and the ML classifier's high confidence score indicate a high likelihood of malicious activity.

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
  • 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/123?utm_term=percy+jackson+series+books+pdf+free+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383698/normal_5fa72cc9486f5.pdfIn PDF document text
    • https://masarifixi.weebly.com/uploads/1/3/4/4/134486171/bubugujugiguwekuve.pdfIn PDF document text
    • https://wisolowiguwo.weebly.com/uploads/1/3/4/6/134630140/8505524.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375341/normal_5f8cfb75c8ced.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/10ecf31f-327c-4400-b385-c9bdc9b4e0f5/words_with_fic_in_them.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f79e4dae-5716-43d0-b3d5-8fe358f11ce6/patukeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4226094-8946-4728-9961-2d0b7eb7fc2c/dekunuxovopoxatewizikibeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b73273b-befd-48a3-a59f-395e14c0e662/pencil_sketch_drawing_images_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a47271a7-974c-4ddd-8182-b77f7de4f0b8/table_saw_extension.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b49c85e-be97-4934-960d-0a5057c1dc6f/speaker_box_design_for_bass.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/ralinazife.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/59438409605.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52aad9f3-bfce-4fd9-905f-f8d8831d46c2/gixisavusapijunerifetap.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_off0000cf8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8D 5624 bytes
SHA-256: 480f39961993d6a49dbcfeb6f057f05464e095ef45804410880f03134574cb25
font_01_sfnt_off0000e2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D8 12688 bytes
SHA-256: 52b23da9344977023e76efb9497388496d2d2434ddcf9fd6f5ff5a5073e0ad9a

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