Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e41da3dad50084…

MALICIOUS

PDF

71.0 KB Created: 2020-11-19 22:38:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6d4b6142a32aba0080c4916c02aaf6fc SHA-1: 76089f9117c8f35b5b0e056b9b4c7258fc843c87 SHA-256: b9e41da3dad500848c53c87d135c36cd395549b1c68f102961ea46af3cdd2e47
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URL that leads to a domain associated with phishing. The document body, though heavily obfuscated, suggests a lure related to 'Santa letter template free printable', indicating a social engineering tactic to drive users to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/aws?utm_term=santa+letter+template+free+printable PDF link annotation
    • https://noxepelobisuse.weebly.com/uploads/1/3/1/8/131871648/1250963.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373753/normal_5f8df15311096.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389370/normal_5fa9b7d1a038b.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/wakapukow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365599/normal_5f8f2a6e17517.pdfIn PDF document text
    • https://lugagixoweliw.weebly.com/uploads/1/3/4/2/134234548/lezaf.pdfIn PDF document text
    • https://pudozewo.weebly.com/uploads/1/3/4/3/134311846/mivol.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/65e7085c-6f4e-42e8-b5a9-fa40bd562001/mary_rowlandson_a_narrative_of_the_captivity.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/disidawikidumakonim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26214cb5-7929-40a0-9f95-9b39c49603ef/hampton_point_sofa.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42E 5112 bytes
SHA-256: 780a2c64f2960fc349df74dc417fc23946986c90e67c38be27645bd307be0451
font_01_sfnt_off0000d576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD576 10376 bytes
SHA-256: 5781c2fd519df0f9b221b0e91920d7f3f5d6dbf2d1ce70124938985d9e7eff7b
font_02_sfnt_off0000f927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF927 16312 bytes
SHA-256: 531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660