Malicious PDF — malware analysis report

Static analysis result for SHA-256 2702e955cd68ba24…

MALICIOUS

PDF

33.7 KB Created: 2020-06-08 03:38:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: d0021764d7bd748e7aa320ab73b9f3b2 SHA-1: 4ed726ce488ec2ca2db082f96a2ef026d61e16d1 SHA-256: 2702e955cd68ba24e7cfc8617f093ce592c38b89c6688fb982a848bec13c89c7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to external websites, many of which are structured as PDF link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to distributing further malware or engaging in SEO abuse. No scripts were extracted, but the PDF structure and embedded URLs suggest a dropper or redirector functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Dropper.Agent-8735036-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8735036-0
  • 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 http://aroundtheclocktots.gammaxiques.org/uploads/1/3/0/7/130738988/130738988.html#singham+d%25C3%25B6n%25C3%25BCyor+t%25C3%25BCrk%25C3%25A7e+dublaj PDF link annotation
    • http://dinkydodah.com/uploads/1/3/0/7/130738567/kesotadotuvowawepuxo.pdfIn PDF document text
    • http://thepolishedhouse.com/uploads/1/3/0/4/130489102/a0a85.pdfIn PDF document text
    • http://rachelkick.com/uploads/1/3/1/4/131454415/6420036.pdfIn PDF document text
    • http://hinojusu.net/uploads/1/3/0/2/130272484/jetofilatemi_gavalizatidekew_sebiwakomuta.pdfIn PDF document text
    • http://4lr.undesirable.us/uploads/1/3/1/1/131164352/bacc2e96f1ddb6.pdfIn PDF document text
    • http://kaizenventurepartners.com/uploads/1/3/0/6/130621941/5439449.pdfIn PDF document text
    • http://134.undesirable.us/uploads/1/3/0/4/130489417/gorusogif.pdfIn PDF document text
    • http://lasna.org/uploads/1/3/0/4/130476502/lilalesaka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://lulagodirej.files.wordpress.com/2020/06/zadiviwaradaki.pdfIn PDF document text
    • https://botemep98974298.files.wordpress.com/2020/06/fawub.pdfIn PDF document text
    • https://sipemuxi.files.wordpress.com/2020/06/60506379251.pdfIn PDF document text
    • https://valunip.files.wordpress.com/2020/06/kogakodife.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5309 12340 bytes
SHA-256: b35f9ef973115c9034f9ca07c91333f314e71f0464085e5fe0b2f99dee2ffe8e