Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c225a13802ddc14…

MALICIOUS

PDF

80.5 KB Created: 2021-01-27 11:55:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e963d9f65f2c5ce14104d65eea3e040b SHA-1: 1df9ccbc50460c21ba6aa35cdac6a1ecd991feb0 SHA-256: 1c225a13802ddc14d24aae8b5042cd964d5804ec52e62fec13882e44b0c8f0e5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan. It contains a large number of external links, forming a link farm, which is a common technique for SEO manipulation or directing users to malicious sites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an intent 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://jottigo.ru/123?utm_term=rousseau+vs+hobbes+state+of+nature PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4390681/normal_5fec07dbcb77d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376369/normal_5fd2d9b7f1318.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/cgjiifV/7997718136.pdfIn PDF document text
    • https://mopelajizefuxo.weebly.com/uploads/1/3/0/7/130739073/1263799.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419413/normal_5fff4d4baddab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443337/normal_5fd684f2c32a8.pdfIn PDF document text
    • https://cdn.sqhk.co/mivufarowiwi/BZVibic/cloud_tie_dye_sweatpants_diy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471513/normal_5fcd69036434b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368468/normal_5fdd49bbe2a44.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492253/normal_5fed6171abd8b.pdfIn PDF document text
    • https://butevexonukuzi.weebly.com/uploads/1/3/2/6/132681970/9997238.pdfIn PDF document text
    • https://cdn.sqhk.co/pevelefotuve/8Ahgicm/74088604661.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468871/normal_5fec9be9d763c.pdfIn PDF document text
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/4719739.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446502/normal_5fcb2fcd0dfed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501229/normal_5fd77fa9d4983.pdfIn PDF document text
    • https://nedidibizexoba.weebly.com/uploads/1/3/0/9/130969065/392323.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/rolefosiju/76757229136.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/145091796.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_off0000f231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF231 2920 bytes
SHA-256: 25d8ad2fdb9f39beae03f44ac9c1588e33edbd88ab167965d29acdba4166906e
font_01_sfnt_off0000fc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8B 5028 bytes
SHA-256: 93d3a7ebb01c82a0c69fc79073164a10d1b17b73107e1442f9c4f9320357102c
font_02_sfnt_off00010daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAA 11116 bytes
SHA-256: 0291a0cfe3fdc584dfde4ccd6e1c9fd8bd368fdd025d25516672dc3e53f88969

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