Malicious PDF — malware analysis report

Static analysis result for SHA-256 18906c0420547927…

MALICIOUS

PDF

76.1 KB Created: 2021-01-15 06:39:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 7e07c9ba64879a568d062f5c7ac4ee12 SHA-1: b1c01ff8ec8d288b2fcf6097a22f85a7aa819fae SHA-256: 18906c0420547927ab075111884c6e0aeef90b4d1eda8a7975771162ec3b5dbf
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one pointing to 'trafficel.ru', suggesting a link farm or phishing attempt. The PDF structure and embedded content, though heavily obfuscated, indicate an attempt to redirect users to external resources, likely for malicious purposes such as ad fraud or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/aws?utm_term=handwriting+worksheets+ks2+free PDF link annotation
    • https://cdn.sqhk.co/faresawuf/eLhcheF/83169997325.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479213/normal_5ff0c8dcb5e88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421939/normal_5fd9e60ca7c7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380675/normal_5fa6fe28ef15a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373520/normal_5fbea1cc0cc35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419827/normal_5faabbfdeee2b.pdfIn PDF document text
    • https://tewavifoma.weebly.com/uploads/1/3/4/4/134482239/budeginumuzuxu.pdfIn PDF document text
    • https://mivoxoxez.weebly.com/uploads/1/3/4/3/134340481/e47b3b76335c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fosalizuzu/16727808582.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/baltimore_ravens_injury_report_week_3.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/associated_press_sports_writing_handbook.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/kuzusomodi.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/wuxivepalige.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/8165845846.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_off0000dfcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCB 5176 bytes
SHA-256: 5fd9aa001ba72f93aa12cc70aff300801d3514f965ff7315e45dab579e368376
font_01_sfnt_off0000f16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16D 10516 bytes
SHA-256: 58947b6c42d430369e86b0c833eab56a72ffcc6c502112d0fbbf67d306c8950a
font_02_sfnt_off0001156c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156C 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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