Malicious PDF — malware analysis report

Static analysis result for SHA-256 a161f511afc8b178…

MALICIOUS

PDF

71.5 KB Created: 2020-12-21 15:43:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d93c6ddebaec54a83e5c5d9b6aabe567 SHA-1: 2438d68a30e887ba1be6c6d3d02cf62c5a79b9aa SHA-256: a161f511afc8b1780b609a5ec5f061e756e6cc2618e8689209c1234a3c0c1073
222 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to downloading an app, and the presence of numerous external links, some pointing to S3 buckets and others to Weebly-hosted PDFs, suggests a link farm or redirection scheme. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffine.ru/strik?utm_term=holla+live+random+video+chat+app+download In PDF document text
    • https://lopekemin.weebly.com/uploads/1/3/4/6/134628767/jekusax_gidula_pevavijulexe.pdfIn PDF document text
    • https://nimimemuxigu.weebly.com/uploads/1/3/4/4/134488465/vuliwosow.pdfIn PDF document text
    • https://zevebijupaxize.weebly.com/uploads/1/3/4/7/134754497/269752.pdfIn PDF document text
    • https://getariko.weebly.com/uploads/1/3/4/9/134904460/1895892.pdfIn PDF document text
    • https://pixogujoxekame.weebly.com/uploads/1/3/4/7/134715770/52e174c88470da.pdfIn PDF document text
    • https://pebezudaxefen.weebly.com/uploads/1/3/4/3/134347708/4af66f4.pdfIn PDF document text
    • https://gojudewusidaza.weebly.com/uploads/1/3/4/8/134888042/gudebixifib_kukejuteji_jolagog.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/ninazarila/54596521497.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/quit_claim_deed_mn_conveyancing_blanks.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/sacramento_county_sheriff_incident_reports.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d5d3fce-e479-4aa1-908b-b6a8f4fe980b/champro_baseball_pants_bp101.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/gedemotijipedokife.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4f0d68ef7301f8b2ad9db/t/5fcb0fe8a51c5a1401a359a3/1607143400586/ultrasound_detector_iphone.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdfd92f5b7bc96605610b65/t/5fe000696a6ad7222f3e8cc4/1608515689367/jagaze.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0F 5248 bytes
SHA-256: 3c8746cc78062c4cf8ed0bbaa21c96fafe3a4f56200ecdfbcfb9f7f301da6ade
font_01_sfnt_off0000ecd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD1 10624 bytes
SHA-256: ba7eae91af4b98a2659942f81dcb28d136340d663d2c38972652834f63976412

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