Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c263ffa8996b10…

MALICIOUS

PDF

45.4 KB Created: 2020-03-26 01:48:24 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 41da63facf5a934f03ec8f06e8c170f5 SHA-1: 089a4f4a725b6dc2bcb372f79763d8c17cc1f049 SHA-256: 85c263ffa8996b10a79c649fa9679b284fff9098e87a4db59bad2e170c5317ca
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links supports this assessment. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to drive traffic to potentially harmful content.

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://evokefitness.net/uploads/1/3/0/5/130589346/130589346.html#reglas+para+la+resta+de+polinomios PDF link annotation
    • http://www.mudgeehomeimprovements.com/uploads/1/3/0/2/130272649/duxev-nifakanujubuka.pdfIn PDF document text
    • http://cricketsms.com/uploads/1/3/0/6/130605497/9889102.pdfIn PDF document text
    • http://777lvloans.com/uploads/1/3/0/4/130490117/da9b2bb5fa96.pdfIn PDF document text
    • http://chefericrupert.com/uploads/1/3/0/3/130379843/56d33b2.pdfIn PDF document text
    • http://awhholdingsltd.com/uploads/1/3/0/7/130775199/gojebu.pdfIn PDF document text
    • http://prettyplump.com.au/uploads/1/3/0/2/130291724/2647752.pdfIn PDF document text
    • http://concordat3.pleasingfood.com/uploads/1/3/1/0/131070688/logodemib-romotefab.pdfIn PDF document text
    • http://thesavagegentleman.com/uploads/1/3/0/2/130270811/06755.pdfIn PDF document text
    • http://www.charlottedreamscapes.com/uploads/1/3/0/5/130546196/b34313f12.pdfIn PDF document text
    • http://www.hanlinsci.org/uploads/1/3/0/7/130739746/87721243943d.pdfIn PDF document text
    • http://www.alumni4ever.store/uploads/1/3/0/8/130814863/roranokonubuteb_difew_topelik_zusegiv.pdfIn PDF document text
    • http://gadaboutmaine.com/uploads/1/3/0/7/130739142/botoxilupaga.pdfIn PDF document text
    • http://www.yourheavenonearth.solutions/uploads/1/3/0/5/130588511/c2eea2702cb27b.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_off00006fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB8 9192 bytes
SHA-256: be18365329c108b6b9abf2fbd01538c7567cc660e09a06f84c3644aa45602835
font_01_sfnt_off00009125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9125 16204 bytes
SHA-256: f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d