Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e781ce3571ca3de…

MALICIOUS

PDF

74.4 KB Created: 2021-02-20 18:28:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1ecefe405ed5b3dd69cb2dd46110e46b SHA-1: f183d8d538aa34fc74ca47029b4ecc3daea986bf SHA-256: 7e781ce3571ca3dea58dc19b89aab0d68d494688d263d33e278ab025fafcae38
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO farms or to direct users to malicious sites. ClamAV and ML classifiers strongly indicate maliciousness, specifically flagging it as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=juan+is+finding+the+equation+of+a+median-median+line PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4455657/normal_5fc944427d16d.pdfIn PDF document text
    • http://premial.su/921646890654m7fi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417406/normal_5fdd6f17f38d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488323/normal_5fef6845e4265.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464702/normal_6012e3df793b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388046/normal_602d1ca1570bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370555/normal_5fec2feb0183d.pdfIn PDF document text
    • https://maladekokox.weebly.com/uploads/1/3/4/7/134745457/47eff89e3ef4.pdfIn PDF document text
    • https://logutidukikov.weebly.com/uploads/1/3/1/3/131380383/5715395.pdfIn PDF document text
    • http://dontbeshy.xyz/luwogepazobasa0kd4j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465015/normal_5fffa4b82445a.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/viboxikuz/34164750367.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/50883988555.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/shingles_vaccine_age_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/felutivibem.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/american_journal_of_gastroenterology_author_guidelines.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_off0000d992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD992 2900 bytes
SHA-256: 40ce0bc9b113ef031639604f059b60aa9f1e41b097d60e75bfbf620cccc66306
font_01_sfnt_off0000e3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D6 5372 bytes
SHA-256: bd23b33d35f3683be0e1f5f5218ad32c798a0b31cc0acea96b48446ca98e8b00
font_02_sfnt_off0000f5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FB 10352 bytes
SHA-256: fe7b0fad4c5fb51933521e83db829c084cfe9b4a05392300a81f5a69c4f085ec

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