Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6407c5923ff32ed…

MALICIOUS

PDF

40.2 KB Created: 2020-03-11 09:43:50 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 255217972336dc9a8187cf4d864600dd SHA-1: d481c3de49dff65e5093d50a259b417e5073628d SHA-256: c6407c5923ff32ed396b7e85b42767582e1e303aad5b08a9e5f12e79497f2b36
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many of which are hosted on domains that appear to be part of a link farm designed to attract search engine traffic. The document body, though partially corrupted, contains text related to exams and dates, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of it being used for malicious purposes, likely to redirect users to sites hosting further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://asmall.shop/uploads/1/3/0/8/130874467/130874467.html#acca+f9+exam+december+2018
    • http://hungrymondays.com.au/uploads/1/3/0/5/130544584/taxipe.pdf
    • http://www.hitwriting.com/uploads/1/3/0/6/130620581/b2a01c71119c0f.pdf
    • http://kfit.co.nz/uploads/1/3/0/7/130738884/wigural-kovewi.pdf
    • http://sammiegeislerdpt.com/uploads/1/3/0/4/130483869/nivagamujigeri-kazapekulu-jiwezato-sudipoluf.pdf
    • http://melodydawkins.com/uploads/1/3/0/7/130775388/8589818.pdf
    • http://iamthesystem.net/uploads/1/3/0/5/130539101/1861318.pdf
    • http://hostmaster.beckybromley.com/uploads/1/3/0/5/130550928/3356248.pdf
    • http://s7ch1bam.butterfly520.com/uploads/1/3/0/8/130874224/4270365.pdf
    • http://www.senditsimply.com/uploads/1/3/0/9/130969339/laxapemomeponefodavi.pdf
    • http://akhdc.com/uploads/1/3/0/8/130874330/bulijotil.pdf
    • http://metzmtaloysius.com/uploads/1/3/0/4/130488662/9326886.pdf
    • http://stargazingangel.com/uploads/1/3/0/6/130621926/gugesinunujase.pdf
    • http://desatascoselpratdellobregat.com/uploads/1/3/0/7/130775528/napunegoteloraluf.pdf
    • http://getfueledforlife.com/uploads/1/3/0/2/130273571/8068957.pdf
    • http://www.marincountytree.com/uploads/1/3/0/7/130738578/9041487.pdf
    • http://bestconference.net/uploads/1/3/0/5/130550992/6134543.pdf
    • http://myersac.com/uploads/1/3/0/4/130483343/xozazimu.pdf
    • http://igrowroses.com/uploads/1/3/0/7/130776854/mopalukuvekog.pdf
    • http://novomancy.net/uploads/1/3/0/8/130813651/naguviwikojudigope.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073f4.bin
8cda305a54f5a725d06a7e6e83cfdb21a2e3fb53b43ac81558e93a8c6f0fb61e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73F4 8156 bytes

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