Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e95d76eeaa45876…

MALICIOUS

PDF

70.9 KB Created: 2021-01-11 11:16:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 7f3035e8d8bb65db6edbce9940ad1b82 SHA-1: ddcafca85a272a79418d17f8a3526c70ccf48996 SHA-256: 1e95d76eeaa4587610152b59984626d480c91f52338613be4c711db9b29e9f2b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The PDF contains a large number of external links, many pointing to other PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://trafftec.ru/aws?utm_term=free+amharic+to+english+dictionary+pdf', is presented in a context that implies it is a free dictionary, likely a lure to attract users. No scripts were extracted, but the PDF structure and numerous external links are strong indicators of malicious intent.

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://trafftec.ru/aws?utm_term=free+amharic+to+english+dictionary+pdf PDF link annotation
    • https://cdn.sqhk.co/pumopijaku/jj8mwih/65398886012.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377128/normal_5fcbdfa6b77a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412593/normal_5fa546512a801.pdfIn PDF document text
    • https://site-1177655.mozfiles.com/files/1177655/my_birthday_party_essay_for_class_6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416150/normal_5fbde7b0640a5.pdfIn PDF document text
    • https://saxipapes.weebly.com/uploads/1/3/0/7/130738636/994938.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485005/normal_5fd1804440886.pdfIn PDF document text
    • https://luxexawasoju.weebly.com/uploads/1/3/4/1/134109261/4662378.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/dadupawo/14352043007.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/29531679732.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/essay_templates_for_college.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/34803041966.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_off0000c877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC877 5416 bytes
SHA-256: 977d37bda3a1219546cfc838e39b59aaa8fe062efc26f6d2baea5a887939ab48
font_01_sfnt_off0000dabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABE 11088 bytes
SHA-256: 2c019e1bb400596e43ea4ecc7537af4f219fd8d1239ae7751f31407e2a5c27e9
font_02_sfnt_off000100b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B3 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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