Malicious PDF — malware analysis report

Static analysis result for SHA-256 df75cea287abac36…

MALICIOUS

PDF

84.9 KB Created: 2021-03-14 16:23:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0263307c9893afceb360a45417860818 SHA-1: e963aec1e81cba7b2c842637f90fa3d76390f46b SHA-256: df75cea287abac36fc5c05d6e4dc74b70e0995c73053c1fbe543beb6cfa2ee6a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=asus+xonar+dx+audio+driver+windows+10 PDF link annotation
    • https://cdn.sqhk.co/bamebuxi/gheWkEM/how_to_adjust_screen_timeout_on_iphone_6.pdfIn PDF document text
    • https://cdn.sqhk.co/sesijisova/chhhfo8/nugirixusi.pdfIn PDF document text
    • https://cdn.sqhk.co/pojuzijix/hjtGQPH/invasion_modern_empire_mod_apk_offline.pdfIn PDF document text
    • http://jidevutijosu.iblogger.org/romet.pdfIn PDF document text
    • https://cdn.sqhk.co/rosisole/4jgH6L0/podcast_guru_app.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/juvuraguvutoxif/kujirivojugenebexok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6781bfcf-ed30-4342-82a9-12a6aa229552/86076948249.pdfIn PDF document text
    • http://dakelajipupak.epizy.com/45306266425.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/17187543411.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d6da538-eced-4709-b9f0-fd3e3c65a9f1/47417293003.pdfIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_ccfdec568a174fea99816fb823853465.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/16557114380.pdfIn PDF document text
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_6c24be5cf0a74534b5c4a0c5b9601963.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/levovod/7624683842.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/what_does_it_mean_to_be_an_american_quote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ebb8bdb-b1db-4877-a8e3-5eda21d7daa3/31421554743.pdfIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_aaec328b34db453a8beab745241dbb34.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF5 5188 bytes
SHA-256: 452f129821275b759ed2d57ecb9d9bffb60514c5b8389ef45f23bab0127010d3
font_01_sfnt_off00011fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC2 11312 bytes
SHA-256: 77fd55721243a54246f7422c47beef15ced802953982c662c02111b91e54d459

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