Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6a66f112de3863…

MALICIOUS

PDF

94.8 KB Created: 2021-03-30 00:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 6a5af81e2aa240fd44186af339f3e6af SHA-1: bddbf1d4fbf9b2dbada595d57760f318e7a7b359 SHA-256: cf6a66f112de3863a73071cf8c5b939cda4584a527aefc557f2eda3695ddd68f
156 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to distribute malware or phishing content. The embedded URLs and the PDF structure point towards an attempt to trick users into visiting malicious websites.

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://nipisod.ru/award?keyword=aegle+marmelos+medicinal+uses+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420747/normal_5fd7934ee5389.pdfIn PDF document text
    • http://erogan-columbia.site/calculus_12_textbook9aoiw.pdfIn PDF document text
    • https://popagupo.weebly.com/uploads/1/3/1/4/131407300/1571797.pdfIn PDF document text
    • http://itsamorem.com/common_ball_hitch_sizeswi1na.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413455/normal_6037edfebd9c0.pdfIn PDF document text
    • https://fagugirawax.weebly.com/uploads/1/3/4/3/134388021/juvemularuvopas.pdfIn PDF document text
    • http://securityverifiedservices.com/bolelixigdtqxu.pdfIn PDF document text
    • https://rifopiponekusu.weebly.com/uploads/1/3/5/3/135346758/31983eec92885.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/e97a7baa87b.pdfIn PDF document text
    • https://jifilebipik.weebly.com/uploads/1/3/4/3/134375607/sumawofibob-dupubuvojerez-pobonag-nurup.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/temujonuwu/best_free_android_phone_games_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/xoruzunopapuru.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/5272640517.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/36777016129.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/zigili.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/dagekotosifutewejeziser.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_off000133a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A7 5464 bytes
SHA-256: 96e6a33e91aed0d7e5354172b1c8b2c10a67c92477d669ce006e0cb71c2e3ccf
font_01_sfnt_off00014626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14626 11464 bytes
SHA-256: d2d349625cf67a8239d0f62eb710c298b589be6fa776f1dce80873a0d0ad4e23

Open this report in the interactive analyzer, or submit your own file for analysis.