Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c2e56693f010b1a…

MALICIOUS

PDF

67.0 KB Created: 2020-03-23 01:54:00 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 12981462dec2624c5a8bc705b9685860 SHA-1: 673f582f6eaa4c6c0ff4add8ad5f029175407769 SHA-256: 7c2e56693f010b1adc730c1efbb1e07b520b4b914f41fa8a6d976ba76244f03b
104 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links to external websites, disguised as free book downloads. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs points towards a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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
  • 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://andmerchant.org/uploads/1/3/0/2/130289332/130289332.html#spoken+english+books+free+download+in+telugu PDF link annotation
    • http://jesseflynnlaw.com/uploads/1/3/0/3/130323175/c47b306befa7ef.pdfIn PDF document text
    • http://www.simplyyogavancouver.com/uploads/1/3/0/6/130604527/1719291.pdfIn PDF document text
    • http://craikpa.net/uploads/1/3/0/5/130590355/9443389.pdfIn PDF document text
    • http://crankybaker.com/uploads/1/3/0/5/130540082/sezowebito-texiziguzidi-davolinon.pdfIn PDF document text
    • http://salvis-pupusas.com/uploads/1/3/0/7/130740174/4332412.pdfIn PDF document text
    • http://www.lechandelierdor.com/uploads/1/3/0/6/130639273/9904879.pdfIn PDF document text
    • http://www.felicecasa.com/uploads/1/3/0/7/130740065/5784759.pdfIn PDF document text
    • http://barbandcarl.com/uploads/1/3/0/3/130323425/mexawutejowaxat.pdfIn PDF document text
    • http://www.michaelmoreaudesign.com/uploads/1/3/0/3/130313140/17e87b790d7b.pdfIn PDF document text
    • http://trademorebonds.com/uploads/1/3/0/6/130604305/jovirumekup.pdfIn PDF document text
    • http://www.nutribienline.net/uploads/1/3/0/5/130543784/4777752.pdfIn PDF document text
    • http://www.mamkoo.com/uploads/1/3/0/5/130588876/02368652471b3c.pdfIn PDF document text
    • http://www.ddiaries.com.au/uploads/1/3/0/8/130813614/6022a333f9ca2.pdfIn PDF document text
    • http://paths2careers.com/uploads/1/3/0/5/130551257/3acca9f321086.pdfIn PDF document text
    • http://ileadconsultancy.co.uk/uploads/1/3/0/4/130490915/672b4540f.pdfIn PDF document text
    • http://pistoncleaner.com/uploads/1/3/0/5/130588651/953db6d65d5.pdfIn PDF document text
    • http://claytonheightssportmassage.ca/uploads/1/3/0/3/130379164/49e7f7.pdfIn PDF document text
    • http://sarahelizabethhurley.com/uploads/1/3/0/2/130272080/lavuwe.pdfIn PDF document text
    • http://www.constructionstudy.info/uploads/1/3/0/7/130775884/518852.pdfIn PDF document text
    • http://wildwrenfarm.com/uploads/1/3/0/4/130490193/4c21cc52a415ca.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC315 9448 bytes
SHA-256: 319b03638d3cba5024d7de3c6de882a12cf347338cec74975ad9d85cfdf5a839
font_01_sfnt_off0000e64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64D 16028 bytes
SHA-256: ca889182d22413b1a5b6446cd5d954c095bfc2c8b2fec1022b19199100617195