Malicious PDF — malware analysis report

Static analysis result for SHA-256 14293171f252af72…

MALICIOUS

PDF

77.8 KB Created: 2020-12-27 15:34:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 71ca0382c0f306d1ddec6266dfc2ddc4 SHA-1: 719170a4b6f302775dafd36066a374d8aed96dc4 SHA-256: 14293171f252af721890a4ad3ce6ba3ce08869f87a4d262ef1070093c374512a
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and an ML classifier. It contains a large number of external links, with the primary URL pointing to a suspicious domain that appears to be part of a link farm. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The embedded content, though heavily obfuscated, suggests an attempt to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafftec.ru/aws?utm_term=byomkesh+bakshi+2015 PDF link annotation
    • https://misaxokur.weebly.com/uploads/1/3/4/3/134354007/1665800.pdfIn PDF document text
    • https://sukutunog.weebly.com/uploads/1/3/5/3/135304197/4108158.pdfIn PDF document text
    • https://kadezejuvi.weebly.com/uploads/1/3/4/6/134603763/vinematefu_muveworumegoj_fiwuduz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381082/normal_5fbcefef583ab.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/najubu/executive_summary_for_case_study_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/hewlett-_packard_company_annual_report_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/gerowukizudubijetuvin.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/90413181765.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/crash_bandicoot_ps1_bin.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/60777852907.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/74288584305.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/64466771809.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/meq_l_to_mg_l_potassium.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/mimesezuvesujok.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16D 5600 bytes
SHA-256: 148f6ac7b574057072a3539c1f8068c461e6c7b800b2ad1a872452f8695c65d4
font_01_sfnt_off0000e468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE468 1936 bytes
SHA-256: 73983ccd477f0e4c07634362c0f9f13a23cea415a26bff37f7f125d59a681190
font_02_sfnt_off0000edab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAB 11572 bytes
SHA-256: 478440f4e6b7b86e77bd865f57815037fe6c7910b79006db2a1b9f5f3c3a5876
font_03_sfnt_off000114f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F7 16164 bytes
SHA-256: ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1

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